The CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS7:CLSA-2026:1781619427 advisory.

  - A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to crash the application. The highest threat from this     vulnerability is to system availability. (CVE-2021-3537)

  - A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing     protection mechanisms and leading to denial of service. (CVE-2021-3541)

  - In libxml2 before 2.9.14, several buffer handling functions in buf.c (xmlBuf*) and tree.c (xmlBuffer*)     don't check for integer overflows. This can result in out-of-bounds memory writes. Exploitation requires a     victim to open a crafted, multi-gigabyte XML file. Other software using libxml2's buffer functions, for     example libxslt through 1.1.35, is affected as well. (CVE-2022-29824)

  - In libxml2 before 2.10.4, parsing of certain invalid XSD schemas can lead to a NULL pointer dereference     and subsequently a segfault. This occurs in xmlSchemaFixupComplexType in xmlschemas.c. (CVE-2023-28484)

  - An issue was discovered in libxml2 before 2.10.4. When hashing empty dict strings in a crafted XML     document, xmlDictComputeFastKey in dict.c can produce non-deterministic values, leading to various logic     and memory errors, such as a double free. This behavior occurs because there is an attempt to use the     first byte of an empty string, and any value is possible (not solely the '\0' value). (CVE-2023-29469)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the libxml2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A vulnerability found in libxml2 in versions before     2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference.
    If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to     crash the application. The highest threat from this     vulnerability is to system availability.(CVE-2021-3537)

  - There is a flaw in the xml entity encoding     functionality of libxml2 in versions before 2.9.11. An     attacker who is able to supply a crafted file to be     processed by an application linked with the affected     functionality of libxml2 could trigger an out-of-bounds     read. The most likely impact of this flaw is to     application availability, with some potential impact to     confidentiality and integrity if an attacker is able to     use memory information to further exploit the     application.(CVE-2021-3517)

  - There's a flaw in libxml2 in versions before 2.9.11. An     attacker who is able to submit a crafted file to be     processed by an application linked with libxml2 could     trigger a use-after-free. The greatest impact from this     flaw is to confidentiality, integrity, and     availability.(CVE-2021-3518)

  - This library allows to manipulate XML files. It     includes supportto read, modify and write XML and HTML     files. There is DTDs supportthis includes parsing and     validation even with complex DtDs, eitherat parse time     or later once the document has been modified. The     outputcan be a simple SAX stream or an(CVE-2021-3541)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the libxml2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - There's a flaw in libxml2 in versions before 2.9.11. An     attacker who is able to submit a crafted file to be     processed by an application linked with libxml2 could     trigger a use-after-free. The greatest impact from this     flaw is to confidentiality, integrity, and     availability.(CVE-2021-3518)

  - There is a flaw in the xml entity encoding     functionality of libxml2 in versions before 2.9.11. An     attacker who is able to supply a crafted file to be     processed by an application linked with the affected     functionality of libxml2 could trigger an out-of-bounds     read. The most likely impact of this flaw is to     application availability, with some potential impact to     confidentiality and integrity if an attacker is able to     use memory information to further exploit the     application.(CVE-2021-3517)

  - A vulnerability found in libxml2 in versions before     2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference.
    If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to     crash the application. The highest threat from this     vulnerability is to system availability.(CVE-2021-3537)

  - This library allows to manipulate XML files. It     includes supportto read, modify and write XML and HTML     files. There is DTDs supportthis includes parsing and     validation even with complex DtDs, eitherat parse time     or later once the document has been modified. The     outputcan be a simple SAX stream or an(CVE-2021-3541)

  - There's a flaw in libxml2's xmllint in versions before     2.9.11. An attacker who is able to submit a crafted     file to be processed by xmllint could trigger a     use-after-free. The greatest impact of this flaw is to     confidentiality, integrity, and     availability.(CVE-2021-3516)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the libxml2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - There's a flaw in libxml2's xmllint in versions before     2.9.11. An attacker who is able to submit a crafted     file to be processed by xmllint could trigger a     use-after-free. The greatest impact of this flaw is to     confidentiality, integrity, and     availability.(CVE-2021-3516)

  - There is a flaw in the xml entity encoding     functionality of libxml2 in versions before 2.9.11. An     attacker who is able to supply a crafted file to be     processed by an application linked with the affected     functionality of libxml2 could trigger an out-of-bounds     read. The most likely impact of this flaw is to     application availability, with some potential impact to     confidentiality and integrity if an attacker is able to     use memory information to further exploit the     application.(CVE-2021-3517)

  - There's a flaw in libxml2 in versions before 2.9.11. An     attacker who is able to submit a crafted file to be     processed by an application linked with libxml2 could     trigger a use-after-free. The greatest impact from this     flaw is to confidentiality, integrity, and     availability.(CVE-2021-3518)

  - A vulnerability found in libxml2 in versions before     2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference.
    If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to     crash the application. The highest threat from this     vulnerability is to system availability.(CVE-2021-3537)

  - This library allows to manipulate XML files. It     includes supportto read, modify and write XML and HTML     files. There is DTDs supportthis includes parsing and     validation even with complex DtDs, eitherat parse time     or later once the document has been modified. The     outputcan be a simple SAX stream or an(CVE-2021-3541)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote NewStart CGSL host, running version MAIN 6.02, has libxml2 packages installed that are affected by multiple vulnerabilities:

  - GNOME project libxml2 v2.9.10 has a global buffer over-read vulnerability in xmlEncodeEntitiesInternal at     libxml2/entities.c. The issue has been fixed in commit 50f06b3e. (CVE-2020-24977)

  - There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted     file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to     confidentiality, integrity, and availability. (CVE-2021-3516)

  - There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker     who is able to supply a crafted file to be processed by an application linked with the affected     functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to     application availability, with some potential impact to confidentiality and integrity if an attacker is     able to use memory information to further exploit the application. (CVE-2021-3517)

  - There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to     be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact     from this flaw is to confidentiality, integrity, and availability. (CVE-2021-3518)

  - A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to crash the application. The highest threat from this     vulnerability is to system availability. (CVE-2021-3537)

  - A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing     protection mechanisms and leading to denial of service. (CVE-2021-3541)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the libxml2 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted     file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to     confidentiality, integrity, and availability. (CVE-2021-3516)

  - There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker     who is able to supply a crafted file to be processed by an application linked with the affected     functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to     application availability, with some potential impact to confidentiality and integrity if an attacker is     able to use memory information to further exploit the application. (CVE-2021-3517)

  - There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to     be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact     from this flaw is to confidentiality, integrity, and availability. (CVE-2021-3518)

  - A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to crash the application. The highest threat from this     vulnerability is to system availability. (CVE-2021-3537)

  - A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing     protection mechanisms and leading to denial of service. (CVE-2021-3541)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to its self-reported version, the Nessus Network Monitor running on the remote host is prior to 6.2.2. It is, therefore, affected by multiple vulnerabilities as referenced in the TNS-2023-23 advisory. Several of the third-party components were found to contain vulnerabilities, and updated versions have been made available by the providers. Out of caution and in line with best practice, Tenable has opted to upgrade these components to address the potential impact of the issues. Nessus Network Monitor 6.2.2 updates the following components:

  - c-ares from version 1.10.0 to version 1.19.1.
  - curl from version 7.79.1 to version 8.1.2.
  - libbzip2 from version 1.0.6 to version 1.0.8.
  - libpcre from version 8.42 to version 8.44.
  - libxml2 from version 2.7.7 to version 2.11.1.
  - libxslt from version 1.1.26 to version 1.1.37.
  - libxmlsec from version 1.2.18 to version 1.2.37.
  - sqlite from version 3.27.2 to version 3.40.1.
  - jQuery Cookie from version 1.3.1 to version 1.4.1.
  - jQuery UI from version 1.13.0 to version 1.13.2.
  - OpenSSL from version 3.0.8 to version 3.0.9.

The version of libxml2 installed on the remote host is prior to 2.9.1-6.6.42. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2023-1743 advisory.

    parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the     xmlParserHandlePEReference function in the case of a '%' character in a DTD name. (CVE-2017-16931)

    GNOME project libxml2 v2.9.10 has a global buffer over-read vulnerability in xmlEncodeEntitiesInternal at     libxml2/entities.c. The issue has been fixed in commit 50f06b3e. (CVE-2020-24977)

    There's a flaw in libxml2's xmllint. An attacker who is able to submit a crafted file to be processed by     xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity,     and availability. (CVE-2021-3516)

    There is a flaw in the xml entity encoding functionality of libxml2. An attacker who is able to supply a     crafted file to be processed by an application linked with the affected functionality of libxml2 could     trigger an out-of-bounds read. The most likely impact of this flaw is to application availability, with     some potential impact to confidentiality and integrity if an attacker is able to use memory information to     further exploit the application. (CVE-2021-3517)

    There's a flaw in libxml2. An attacker who is able to submit a crafted file to be processed by an     application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to     confidentiality, integrity, and availability. (CVE-2021-3518)

    A NULL pointer dereference flaw was found in libxml2, where it did not propagate errors while parsing XML     mixed content. This flaw causes the application to crash if an untrusted XML document is parsed in     recovery mode and post validated. The highest threat from this vulnerability is to system availability.
    (CVE-2021-3537)

    A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing     protection mechanisms and leading to denial of service. (CVE-2021-3541)

    valid.c in libxml2 before 2.9.13 has a use-after-free of ID and IDREF attributes. (CVE-2022-23308)

    A flaw was found in the libxml2 library in functions used to manipulate the xmlBuf and the xmlBuffer     types. A substantial input causes values to calculate buffer sizes to overflow, resulting in an out-of-     bounds write. (CVE-2022-29824)

    An issue was discovered in libxml2 before 2.10.3. When parsing a multi-gigabyte XML document with the     XML_PARSE_HUGE parser option enabled, several integer counters can overflow. This results in an attempt to     access an array at a negative 2GB offset, typically leading to a segmentation fault. (CVE-2022-40303)

    An issue was discovered in libxml2 before 2.10.3. Certain invalid XML entity definitions can corrupt a     hash table key, potentially leading to subsequent logic errors. In one case, a double-free can be     provoked. (CVE-2022-40304)

    A NULL pointer dereference exists when parsing (invalid) XML schemas in libxml2     xmlSchemaCheckCOSSTDerivedOK (CVE-2023-28484)

    libxml2 Hashing of empty dict strings isn't deterministic. When hashing empty strings which aren't null-     terminated, xmlDictComputeFastKey could produce inconsistent results. This could lead to various logic or     memory errors, including double frees. (CVE-2023-29469)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

New libxml2 packages are available for Slackware 14.0, 14.1, 14.2, and -current to fix a security issue.

Daniel Veillard reports :

A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.

The remote Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4991-1 advisory.

    Yunho Kim discovered that libxml2 incorrectly handled certain error conditions. A remote attacker could     exploit this with a crafted XML file to cause a denial of service, or possibly cause libxml2 to expose     sensitive information. This issue only affected Ubuntu 14.04 ESM, and Ubuntu 16.04 ESM. (CVE-2017-8872)

    Zhipeng Xie discovered that libxml2 incorrectly handled certain XML schemas. A remote attacker could     possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 ESM, Ubuntu     16.04 ESM, and Ubuntu 18.04 LTS. (CVE-2019-20388)

    It was discovered that libxml2 incorrectly handled invalid UTF-8 input. A remote attacker could possibly     exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service. This     issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu     20.10. (CVE-2020-24977)

    It was discovered that libxml2 incorrectly handled invalid UTF-8 input. A remote attacker could possibly     exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of service.
    (CVE-2021-3517)

    It was discovered that libxml2 did not properly handle certain crafted XML files. A local attacker could     exploit this with a crafted input to cause libxml2 to crash, resulting in a denial of service, or possibly     execute arbitrary code. (CVE-2021-3516, CVE-2021-3518)

    It was discovered that libxml2 incorrectly handled error states. A remote attacker could exploit this with     a crafted XML file to cause libxml2 to crash, resulting in a denial of service. (CVE-2021-3537)

    Sebastian Pipping discovered that libxml2 did not properly handle certain crafted XML files. A remote     attacker could exploit this with a crafted XML file to cause libxml2 to crash, resulting in a denial of     service. This issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-3541)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SUSE15 host has packages installed that are affected by a vulnerability as referenced in the openSUSE-SU-2021:0886-1 advisory.

  - A flaw exists in libxml2 which allows for an exponential entity expansion attack which can bypass existing     protection mechanisms leading to a potential denial of service. (CVE-2021-3541)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:2569 advisory.

    The libxml2 library is a development toolbox providing the implementation of various XML standards.

    Security Fix(es):

    * libxml2: Use-after-free in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3516)

    * libxml2: Heap-based buffer overflow in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3517)

    * libxml2: Use-after-free in xmlXIncludeDoProcess() in xinclude.c (CVE-2021-3518)

    * libxml2: NULL pointer dereference when post-validating mixed content parsed in recovery mode     (CVE-2021-3537)

    * libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms (CVE-2021-3541)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
360723	CentOS Linux 7 [TuxCare] Security Update: libxml2 / libxml2-devel / libxml2-python / libxml2-static Multiple Vulnerabilities (CENTOS7:CLSA-2026:1781619427)	Nessus	CentOS Local Security Checks	2026/10/1	2026/10/1	critical
153086	EulerOS 2.0 SP5 : libxml2 (EulerOS-SA-2021-2339)	Nessus	Huawei Local Security Checks	2021/9/7	2023/12/1	high
153349	EulerOS 2.0 SP2 : libxml2 (EulerOS-SA-2021-2406)	Nessus	Huawei Local Security Checks	2021/9/14	2023/11/30	high
152286	EulerOS 2.0 SP9 : libxml2 (EulerOS-SA-2021-2275)	Nessus	Huawei Local Security Checks	2021/8/9	2023/12/6	high
160750	NewStart CGSL MAIN 6.02 : libxml2 Multiple Vulnerabilities (NS-SA-2022-0050)	Nessus	NewStart CGSL Local Security Checks	2022/5/9	2023/11/1	high
156511	EulerOS Virtualization 3.0.2.6 : libxml2 (EulerOS-SA-2021-2884)	Nessus	Huawei Local Security Checks	2022/1/6	2023/11/21	high
177842	Nessus Network Monitor < 6.2.2 Multiple Vulnerabilities (TNS-2023-23)	Nessus	Misc.	2023/6/30	2023/7/6	critical
175091	Amazon Linux AMI : libxml2 (ALAS-2023-1743)	Nessus	Amazon Linux Local Security Checks	2023/5/4	2024/12/11	critical
149513	Slackware 14.0 / 14.1 / 14.2 / current : libxml2 (SSA:2021-135-01)	Nessus	Slackware Local Security Checks	2021/5/17	2021/7/14	medium
149857	FreeBSD : libxml2 -- Possible denial of service (524bd03a-bb75-11eb-bf35-080027f515ea)	Nessus	FreeBSD Local Security Checks	2021/5/24	2021/7/14	medium
150858	Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS : libxml2 vulnerabilities (USN-4991-1)	Nessus	Ubuntu Local Security Checks	2021/6/17	2025/9/3	critical
151082	openSUSE 15 Security Update : libxml2 (openSUSE-SU-2021:0886-1)	Nessus	SuSE Local Security Checks	2021/6/28	2022/1/21	medium
151142	RHEL 8 : libxml2 (RHSA-2021:2569)	Nessus	Red Hat Local Security Checks	2021/6/29	2024/11/7	high

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