The remote SUSE Linux SUSE15 host has packages installed that are affected by a vulnerability as referenced in the openSUSE-SU-2021:1815-1 advisory.

  - A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP     packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or     potential other impact. (CVE-2021-23017)

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

According to the version of the nginx packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - A security issue in nginx resolver was identified,     which might allow an attacker who is able to forge UDP     packets from the DNS server to cause 1-byte memory     overwrite, resulting in worker process crash or     potential other impact.(CVE-2021-23017)

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 Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2021:2259 advisory.

  - A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP     packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or     potential other impact. (CVE-2021-23017)

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

The remote Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2022:0323 advisory.

  - A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP     packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or     potential other impact. (CVE-2021-23017)

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

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by a vulnerability as referenced in the ALINUX3-SA-2021:0036 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2021-23017:
    A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP     packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or     potential other impact.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

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

The remote MiracleLinux 8 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2022-3028:01 advisory.

    * nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a     pointer to a root domain name (CVE-2021-23017)

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

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

The remote MiracleLinux 7 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2021-1875:01 advisory.

    * nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name     (CVE-2021-23017)

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

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

The installed version of nginx is 0.6.18 prior to 1.20.1. It is, therefore, affected by a remote code execution vulnerability. A security issue in nginx resolver was identified, which might allow an unauthenticated remote attacker to cause 1-byte memory overwrite by using a specially crafted DNS response, resulting in worker process crash or, potentially, in arbitrary code execution.

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

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0016 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2019-9511:
    Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization     manipulation, potentially leading to a denial of service. The attacker requests a large amount of data     from a specified resource over multiple streams. They manipulate window size and stream priority to force     the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can     consume excess CPU, memory, or both.

    CVE-2019-9513:
    Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service.
    The attacker creates multiple request streams and continually shuffles the priority of the streams in a     way that causes substantial churn to the priority tree. This can consume excess CPU.

    CVE-2019-9516:
    Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service.
    The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally     Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and     keep the allocation alive until the session dies. This can consume excess memory.

    CVE-2021-23017:
    A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP     packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or     potential other impact.

Tenable has extracted the preceding description block directly from the Tencent 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.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-4967-1 advisory.

    Luis Merino, Markus Vervier, and Eric Sesterhenn discovered that nginx incorrectly handled responses to     the DNS resolver. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of     service, or possibly execute arbitrary code.

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

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

This update for nginx fixes the following issues :

CVE-2021-23017: nginx DNS resolver off-by-one heap write (bsc#1186126)

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

The version of nginx installed on the remote host is prior to 1.18.0-1.43. It is, therefore, affected by a vulnerability as referenced in the ALAS-2021-1507 advisory.

    A flaw was found in nginx. An off-by-one error while processing DNS responses allows a network attacker to     write a dot character out of bounds in a heap allocated buffer which can allow overwriting the least     significant byte of next heap chunk metadata likely leading to a remote code execution in certain     circumstances. The highest threat from this vulnerability is to data confidentiality and integrity as well     as system availability. (CVE-2021-23017)

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

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

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-2259 advisory.

    [1.18.0-3.1.0.1]
    - Remove Red Hat references [Orabug: 29498217]

    [1:1.18.0-3.1]
    - Resolves: #1963178 - CVE-2021-23017 nginx:1.18/nginx: Off-by-one in       ngx_resolver_copy() when labels are followed by a pointer to a root       domain name

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

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 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:2278 advisory.

    nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency,     performance, and low memory usage.

    Security Fix(es):

    * nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name     (CVE-2021-23017)

    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 this issue but has instead relied only on the application's self-reported version number.

The remote host is affected by the vulnerability described in GLSA-202105-38 (nginx: Remote code execution)

    It was discovered that nginx did not properly handle DNS responses when       &ldquo;resolver&rdquo; directive is used.
  Impact :

    A remote attacker, able to provide DNS responses to a nginx instance,       could cause the execution of arbitrary code with the privileges of the       process or a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The version of nginx installed on the remote host is prior to 1.20.0-2. It is, therefore, affected by a vulnerability as referenced in the ALAS2NGINX1-2023-003 advisory.

    A flaw was found in nginx. An off-by-one error while processing DNS responses allows a network attacker to     write a dot character out of bounds in a heap allocated buffer which can allow overwriting the least     significant byte of next heap chunk metadata likely leading to a remote code execution in certain     circumstances. The highest threat from this vulnerability is to data confidentiality and integrity as well     as system availability. (CVE-2021-23017)

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

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

The version of Junos OS installed on the remote host is affected by multiple vulnerabilities as referenced in the JSA88135 advisory.

  - NGINX before 1.13.6 has a buffer overflow for years that exceed four digits, as demonstrated by a file     with a modification date in 1969 that causes an integer overflow (or a false modification date far in the     future), when encountered by the autoindex module. (CVE-2017-20005)

  - The resolver in nginx before 1.8.1 and 1.9.x before 1.9.10 allows remote attackers to cause a denial of     service (invalid pointer dereference and worker process crash) via a crafted UDP DNS response.
    (CVE-2016-0742)

  - Use-after-free vulnerability in the resolver in nginx 0.6.18 through 1.8.0 and 1.9.x before 1.9.10 allows     remote attackers to cause a denial of service (worker process crash) or possibly have unspecified other     impact via a crafted DNS response related to CNAME response processing. (CVE-2016-0746)

  - The resolver in nginx before 1.8.1 and 1.9.x before 1.9.10 does not properly limit CNAME resolution, which     allows remote attackers to cause a denial of service (worker process resource consumption) via vectors     related to arbitrary name resolution. (CVE-2016-0747)

  - The nginx package before 1.6.2-5+deb8u3 on Debian jessie, the nginx packages before 1.4.6-1ubuntu3.6 on     Ubuntu 14.04 LTS, before 1.10.0-0ubuntu0.16.04.3 on Ubuntu 16.04 LTS, and before 1.10.1-0ubuntu1.1 on     Ubuntu 16.10, and the nginx ebuild before 1.10.2-r3 on Gentoo allow local users with access to the web     server user account to gain root privileges via a symlink attack on the error log. (CVE-2016-1247)

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
151752	openSUSE 15 Security Update : nginx (openSUSE-SU-2021:1815-1)	Nessus	SuSE Local Security Checks	2021/7/16	2023/3/23	high
152409	EulerOS 2.0 SP8 : nginx (EulerOS-SA-2021-2308)	Nessus	Huawei Local Security Checks	2021/8/10	2023/3/23	high
157769	Rocky Linux 8 : nginx:1.18 (RLSA-2021:2259)	Nessus	Rocky Linux Local Security Checks	2022/2/9	2023/11/6	high
184476	Rocky Linux 8 : nginx:1.20 (RLSA-2022:0323)	Nessus	Rocky Linux Local Security Checks	2023/11/6	2023/11/6	high
236746	Alibaba Cloud Linux 3 : 0036: nginx:1.18 (ALINUX3-SA-2021:0036)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	high
294118	MiracleLinux 8 : nginx:1.20 (AXSA:2022-3028:01)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high
294519	MiracleLinux 7 : rh-nginx116-nginx-1.16.1-6.0.1.el7.AXS7 (AXSA:2021-1875:01)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high
150154	nginx 0.6.x < 1.20.1 1-Byte Memory Overwrite RCE	Nessus	Web Servers	2021/6/3	2026/7/17	high
240029	TencentOS Server 3: nginx:1.20 (TSSA-2022:0016)	Nessus	Tencent Local Security Checks	2025/6/16	2025/12/4	high
149991	Ubuntu 18.04 LTS / 20.04 LTS : nginx vulnerability (USN-4967-1)	Nessus	Ubuntu Local Security Checks	2021/5/27	2024/8/27	high
150093	SUSE SLES15 Security Update : nginx (SUSE-SU-2021:1815-1)	Nessus	SuSE Local Security Checks	2021/6/1	2023/3/23	high
150150	Amazon Linux AMI : nginx (ALAS-2021-1507)	Nessus	Amazon Linux Local Security Checks	2021/6/2	2024/12/11	high
150349	Oracle Linux 8 : nginx:1.18 (ELSA-2021-2259)	Nessus	Oracle Linux Local Security Checks	2021/6/8	2024/11/1	high
150785	RHEL 7 : rh-nginx116-nginx (RHSA-2021:2278)	Nessus	Red Hat Local Security Checks	2021/6/15	2024/11/7	high
156987	GLSA-202105-38 : nginx: Remote code execution	Nessus	Gentoo Local Security Checks	2022/1/24	2022/9/21	high
181960	Amazon Linux 2 : nginx (ALASNGINX1-2023-003)	Nessus	Amazon Linux Local Security Checks	2023/9/27	2024/12/11	high
310760	Juniper Junos OS Multiple Vulnerabilities (JSA88135)	Nessus	Junos Local Security Checks	2026/4/28	2026/4/30	medium

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