The remote SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:2127-1 advisory.

  - Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer     dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers,     leading to a Denial of Service (CVE-2020-13950)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in     mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team     could create one, though some particular compiler and/or compilation option might make it possible, with     limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow     (CVE-2020-35452)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can     cause a NULL pointer dereference and crash, leading to a possible Denial Of Service (CVE-2021-26690)

  - In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server     could cause a heap overflow (CVE-2021-26691)

  - Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'     (CVE-2021-30641)

  - Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the     size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of     these restrictions and HTTP response is sent to the client with a status code indicating why the request     was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the     offending header was the very first one received or appeared in a a footer. This led to a NULL pointer     dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2     request is easy to craft and submit, this can be exploited to DoS the server. This issue affected     mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never     released. (CVE-2021-31618)

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

An update of the httpd package has been released.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4994-1 advisory.

    Marc Stern discovered that the Apache mod_proxy_http module incorrectly handled certain requests. A remote     attacker could possibly use this issue to cause Apache to crash, resulting in a denial of service. This     issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2020-13950)

    Antonio Morales discovered that the Apache mod_auth_digest module incorrectly handled certain Digest     nonces. A remote attacker could possibly use this issue to cause Apache to crash, resulting in a denial of     service. (CVE-2020-35452)

    Antonio Morales discovered that the Apache mod_session module incorrectly handled certain Cookie headers.
    A remote attacker could possibly use this issue to cause Apache to crash, resulting in a denial of     service. (CVE-2021-26690)

    Christophe Jaillet discovered that the Apache mod_session module incorrectly handled certain SessionHeader     values. A remote attacker could use this issue to cause Apache to crash, resulting in a denial of service,     or possibly execute arbitrary code. (CVE-2021-26691)

    Christoph Anton Mitterer discovered that the new MergeSlashes configuration option resulted in unexpected     behaviour in certain situations. (CVE-2021-30641)

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 version of httpd installed on the remote host is prior to 2.4.48-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1659 advisory.

    A flaw was found in Apache httpd. The mod_proxy_wstunnel module tunnels non-upgraded connections.
    (CVE-2019-17567)

    Apache HTTP Server versions 2.4.0 to 2.4.46 Unprivileged local users can stop httpd on Windows     (CVE-2020-13938)

    A flaw was found In Apache httpd. The mod_proxy has a NULL pointer dereference. The highest threat from     this vulnerability is to data confidentiality and integrity as well as system availability.
    (CVE-2020-13950)

    A flaw was found in Apache httpd. The mod_auth_digest has a single zero byte stack overflow. The highest     threat from this vulnerability is to data confidentiality and integrity as well as system availability.
    (CVE-2020-35452)

    A NULL pointer dereference was found in Apache httpd mod_session. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-26690)

    A heap overflow flaw was found In Apache httpd mod_session. The highest threat from this vulnerability is     to system availability. (CVE-2021-26691)

    A flaw was found in Apache httpd. A possible regression from an earlier security fix broke behavior of     MergeSlashes. The highest threat from this vulnerability is to data integrity. (CVE-2021-30641)

    A null pointer de-reference was found in the way httpd handled specially crafted HTTP/2 request. A remote     attacker could use this flaw to crash the httpd child process, causing temporary denial of service.
    (CVE-2021-31618)

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.

The version of httpd installed on the remote host is prior to 2.4.48-2. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1674 advisory.

    A flaw was found in Apache httpd. The mod_proxy_wstunnel module tunnels non-upgraded connections.
    (CVE-2019-17567)

    A flaw was found in HTTPd. In some Apache HTTP Server versions, unprivileged local users can stop HTTPd on     Windows. The highest threat from this vulnerability is to system availability. (CVE-2020-13938)

    A flaw was found In Apache httpd. The mod_proxy has a NULL pointer dereference. The highest threat from     this vulnerability is to data confidentiality and integrity as well as system availability.
    (CVE-2020-13950)

    A flaw was found in Apache httpd. The mod_auth_digest has a single zero byte stack overflow. The highest     threat from this vulnerability is to data confidentiality and integrity as well as system availability.
    (CVE-2020-35452)

    A NULL pointer dereference was found in Apache httpd mod_session. The highest threat from this     vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-26690)

    A heap overflow flaw was found In Apache httpd mod_session. The highest threat from this vulnerability is     to system availability. (CVE-2021-26691)

    A flaw was found in Apache httpd. A possible regression from an earlier security fix broke behavior of     MergeSlashes. The highest threat from this vulnerability is to data integrity. (CVE-2021-30641)

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.

远程 Redhat Enterprise Linux 8 主机上安装的多个程序包受到 RHSA-2022: 5163 公告中提及的漏洞的影响。

  - httpd：mod_proxy 空指针取消引用缺陷 (CVE-2020-13950)

请注意，Nessus 尚未测试此问题，而是只依据应用程序自我报告的版本号进行判断。

远程 Rocky Linux 8 主机上存在安装的程序包该程序包受到公告 RLSA-2022:5163 中提及的漏洞的影响。

  - 在 Apache HTTP Server 版本 2.4.41 到 2.4.46 中，可使用 Content-Length 和 Transfer-Encoding 标头通过特别构建的请求使 mod_proxy_http 崩溃（空指针取消引用），从而导致拒绝服务 (CVE-2020-13950)

请注意，Nessus 尚未测试此问题，而是只依据应用程序自我报告的版本号进行判断。

远程 Redhat Enterprise Linux 7 / 8 主机上安装的程序包受到 RHSA-2021: 4614 公告中提及的多个漏洞影响。

  - httpd：非升级连接的 mod_proxy_wstunnel 隧道 (CVE-2019-17567)

  - pcre：当 UTF 被禁用且 \X 或 \R 已修复大于 1 的限定符时，JIT 中发生缓冲区过度读取 (CVE-2019-20838)

  - httpd：mod_proxy 空指针取消引用缺陷 (CVE-2020-13950)

  - pcre：解析标注数值参数时发生整数溢出 (CVE-2020-14155)

  - httpd：mod_auth_digest 中的单零字节堆栈溢出问题 (CVE-2020-35452)

  - openssl：CipherUpdate 中存在整数溢出问题 (CVE-2021-23840)

  - openssl：X509_issuer_and_serial_hash() 中存在空指针取消引用问题 (CVE-2021-23841)

  - httpd：mod_session：解析 Cookie 标头时发生空指针取消引用 (CVE-2021-26690)

  - httpd：mod_session：通过构建的 SessionHeader 值造成堆溢出 (CVE-2021-26691)

  - httpd：- 在 MergeSlashes OFF 情况下发生非预期的 URL 匹配 (CVE-2021-30641)

  - httpd：通过畸形请求造成的空指针取消引用 (CVE-2021-34798)

  - Red Hat JBCS：带 /..;/ 的 URL 规范化问题会导致信息泄露 (CVE-2021-3688)

  - openssl：处理 ASN.1 字符串时发生读取缓冲区溢出 (CVE-2021-3712)

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

The remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2022:5163 advisory.

  - httpd: mod_proxy NULL pointer dereference (CVE-2020-13950)

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 multiple vulnerabilities as referenced in the ALINUX3-SA-2022:0133 advisory.

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

    CVE-2020-13950:
    Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer     dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers,     leading to a Denial of Service

    CVE-2020-35452:
    Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in     mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team     could create one, though some particular compiler and/or compilation option might make it possible, with     limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow

    CVE-2021-33193:
    A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead     to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

    CVE-2021-36160:
    A carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and     crash (DoS). This issue affects Apache HTTP Server versions 2.4.30 to 2.4.48 (inclusive).

    CVE-2022-30184:
    .NET and Visual Studio Information Disclosure Vulnerability.

    CVE-2021-44224:
    A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL     pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for     requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This     issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).

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

New httpd packages are available for Slackware 14.0, 14.1, 14.2, and
-current to fix security issues.

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:0908-1 advisory.

  - Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer     dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers,     leading to a Denial of Service (CVE-2020-13950)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in     mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team     could create one, though some particular compiler and/or compilation option might make it possible, with     limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow     (CVE-2020-35452)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can     cause a NULL pointer dereference and crash, leading to a possible Denial Of Service (CVE-2021-26690)

  - In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server     could cause a heap overflow (CVE-2021-26691)

  - Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'     (CVE-2021-30641)

  - Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the     size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of     these restrictions and HTTP response is sent to the client with a status code indicating why the request     was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the     offending header was the very first one received or appeared in a a footer. This led to a NULL pointer     dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2     request is easy to craft and submit, this can be exploited to DoS the server. This issue affected     mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never     released. (CVE-2021-31618)

Note that Nessus has not tested for this issue 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 multiple vulnerabilities as referenced in the openSUSE-SU-2021:2127-1 advisory.

  - Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer     dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers,     leading to a Denial of Service (CVE-2020-13950)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in     mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team     could create one, though some particular compiler and/or compilation option might make it possible, with     limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow     (CVE-2020-35452)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can     cause a NULL pointer dereference and crash, leading to a possible Denial Of Service (CVE-2021-26690)

  - In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server     could cause a heap overflow (CVE-2021-26691)

  - Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'     (CVE-2021-30641)

  - Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the     size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of     these restrictions and HTTP response is sent to the client with a status code indicating why the request     was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the     offending header was the very first one received or appeared in a a footer. This led to a NULL pointer     dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2     request is easy to craft and submit, this can be exploited to DoS the server. This issue affected     mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never     released. (CVE-2021-31618)

Note that Nessus has not tested for this issue 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
151095	SUSE SLED15 / SLES15 Security Update : apache2 (SUSE-SU-2021:2127-1)	Nessus	SuSE Local Security Checks	2021/6/28	2023/7/13	critical
151436	Photon OS 1.0: Httpd PHSA-2021-1.0-0409	Nessus	PhotonOS Local Security Checks	2021/7/7	2024/7/22	critical
150940	Ubuntu 18.04 LTS / 20.04 LTS : Apache HTTP Server vulnerabilities (USN-4994-1)	Nessus	Ubuntu Local Security Checks	2021/6/21	2025/9/3	critical
150983	Amazon Linux 2 : httpd (ALAS-2021-1659)	Nessus	Amazon Linux Local Security Checks	2021/6/24	2024/12/11	critical
151272	Amazon Linux 2 : httpd (ALAS-2021-1674)	Nessus	Amazon Linux Local Security Checks	2021/7/1	2024/12/11	critical
162479	RHEL 8：httpd：2.4 (RHSA-2022: 5163)	Nessus	Red Hat Local Security Checks	2022/6/22	2025/4/8	high
162838	Rocky Linux 8 httpd:2.4 (RLSA-2022:5163)	Nessus	Rocky Linux Local Security Checks	2022/7/8	2023/11/7	high
155223	RHEL 7 / 8：Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP10 (RHSA-2021: 4614)	Nessus	Red Hat Local Security Checks	2021/11/11	2024/11/7	critical
162987	CentOS 8 : httpd:2.4 (CESA-2022:5163)	Nessus	CentOS Local Security Checks	2022/7/11	2023/2/8	high
236430	Alibaba Cloud Linux 3 : 0133: httpd:2.4 (ALINUX3-SA-2022:0133)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	high
153184	Photon OS 3.0: Httpd PHSA-2021-3.0-0257	Nessus	PhotonOS Local Security Checks	2021/9/9	2025/8/22	high
150334	Slackware 14.0 / 14.1 / 14.2 / current : httpd (SSA:2021-158-01)	Nessus	Slackware Local Security Checks	2021/6/8	2021/6/10	critical
151068	openSUSE 15 Security Update : apache2 (openSUSE-SU-2021:0908-1)	Nessus	SuSE Local Security Checks	2021/6/28	2021/9/24	critical
151694	openSUSE 15 Security Update : apache2 (openSUSE-SU-2021:2127-1)	Nessus	SuSE Local Security Checks	2021/7/16	2021/9/24	critical

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