The Apache httpd reports :

- moderate: mod_proxy_wstunnel tunneling of non Upgraded connections (CVE-2019-17567)

- moderate: Improper Handling of Insufficient Privileges (CVE-2020-13938)

- low: mod_proxy_http NULL pointer dereference (CVE-2020-13950)

- low: mod_auth_digest possible stack overflow by one nul byte (CVE-2020-35452)

- low: mod_session NULL pointer dereference (CVE-2021-26690)

- low: mod_session response handling heap overflow (CVE-2021-26691)

- moderate: Unexpected URL matching with 'MergeSlashes OFF' (CVE-2021-30641)

- important: NULL pointer dereference on specially crafted HTTP/2 request (CVE-2021-31618)

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2021-2774:01 advisory.

    * httpd: mod_session: NULL pointer dereference when parsing Cookie header (CVE-2021-26690)
      * httpd: Unexpected URL matching with 'MergeSlashes OFF' (CVE-2021-30641)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2021-2541:01 advisory.

    httpd: mod_session: NULL pointer dereference when parsing Cookie header     (CVE-2021-26690)         httpd: Unexpected URL matching with 'MergeSlashes OFF' (CVE-2021-30641)         httpd: Regression of CVE-2021-40438 and CVE-2021-26691 fixes in MIRACLE     LINUX 8.4 (CVE-2021-20325)     CVE(s):
    CVE-2021-26690     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-2021-30641     Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'     CVE-2021-20325
    ** RESERVED ** This candidate has been reserved by an organization or individual that will use it when     announcing a new security problem. When the candidate has been publicized, the details for this candidate     will be provided.
    Modularity name: httpd     Stream name: 2.4

Tenable has extracted the preceding description block directly from the MiracleLinux 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 SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:2004-1 advisory.

    - CVE-2021-30641: Fixed MergeSlashes regression (bsc#1187174)
    - CVE-2021-31618: Fixed NULL pointer dereference on specially crafted HTTP/2 request (bsc#1186924)
    - CVE-2020-35452: Fixed Single zero byte stack overflow in mod_auth_digest (bsc#1186922)
    - CVE-2021-26690: Fixed mod_session NULL pointer dereference in parser (bsc#1186923)
    - CVE-2021-26691: Fixed Heap overflow in mod_session (bsc#1187017)
    - Fixed potential content spoofing with default error pages (bsc#1182703)
    - Fixed for an issue when 'gensslcert' does not set CA:True. (bsc#1180530)

Tenable has extracted the preceding description block directly from the SUSE 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 SLED12 / SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:2006-1 advisory.

    - fixed CVE-2021-30641 [bsc#1187174]: MergeSlashes regression
    - fixed CVE-2021-31618 [bsc#1186924]: NULL pointer dereference on specially crafted HTTP/2 request
    - fixed CVE-2020-35452 [bsc#1186922]: Single zero byte stack overflow in mod_auth_digest
    - fixed CVE-2021-26690 [bsc#1186923]: mod_session NULL pointer dereference in parser
    - fixed CVE-2021-26691 [bsc#1187017]: Heap overflow in mod_session

Tenable has extracted the preceding description block directly from the SUSE 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 16.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4994-2 advisory.

    USN-4994-1 fixed several vulnerabilities in Apache. This update provides the corresponding update for     Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.



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 Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-4257 advisory.

    - Add checks on the configured UDS path [Orabug: 33412270][CVE-2021-40438]
    - Resolves: #1972500 - CVE-2021-30641 httpd:2.4/httpd: MergeSlashes regression
    - Resolves: #1968307 - CVE-2021-26690 httpd:2.4/httpd: mod_session NULL pointer       dereference in parser
    - Resolves: #1869077 - CVE-2020-11993 httpd:2.4/mod_http2: httpd:
      mod_http2 concurrent pool usage

    mod_md

Tenable has extracted the preceding description block directly from the Oracle 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 SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:2127-1 advisory.

    - fixed CVE-2021-30641 [bsc#1187174]: MergeSlashes regression
    - fixed CVE-2021-31618 [bsc#1186924]: NULL pointer dereference on specially crafted HTTP/2 request
    - fixed CVE-2020-13950 [bsc#1187040]: mod_proxy NULL pointer dereference
    - fixed CVE-2020-35452 [bsc#1186922]: Single zero byte stack overflow in mod_auth_digest
    - fixed CVE-2021-26690 [bsc#1186923]: mod_session NULL pointer dereference in parser
    - fixed CVE-2021-26691 [bsc#1187017]: Heap overflow in mod_session

Tenable has extracted the preceding description block directly from the SUSE 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 httpd24 installed on the remote host is prior to 2.4.48-1.92. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2021-1514 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 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.

The version of Oracle HTTP Server installed on the remote host are affected by multiple vulnerabilities as referenced in the Jan 2023 CPU advisory.

  - Vulnerability in the Oracle HTTP Server product of Oracle Fusion Middleware (component: Centralized Thirdparty     Jars (Expat)). The supported version that is affected is 12.2.1.4.0. Easily exploitable vulnerability allows     unauthenticated attacker with network access via HTTP to compromise Oracle HTTP Server. Successful attacks of     this vulnerability can result in takeover of Oracle HTTP Server. (CVE-2022-25236)

  - Vulnerability in the Oracle HTTP Server product of Oracle Fusion Middleware (component: SSL Module (Apache HTTP     Server)). The supported version that is affected is 12.2.1.4.0. Easily exploitable vulnerability allows     unauthenticated attacker with network access via HTTPS to compromise Oracle HTTP Server. Successful attacks of     this vulnerability can result in takeover of Oracle HTTP Server. (CVE-2022-31813)     

  - Vulnerability in the Oracle HTTP Server product of Oracle Fusion Middleware (component: SSL Module (OpenSSL)).     The supported version that is affected is 12.2.1.4.0. Easily exploitable vulnerability allows unauthenticated     attacker with network access via HTTPS to compromise Oracle HTTP Server. Successful attacks of this vulnerability     can result in takeover of Oracle HTTP Server. (CVE-2022-2274)

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017605 advisory.

    Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'

Tenable has extracted the preceding description block directly from the Unity 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 Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2022:0017 advisory.

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

    CVE-2019-0190:
    A bug exists in the way mod_ssl handled client renegotiations. A remote attacker could send a carefully     crafted request that would cause mod_ssl to enter a loop leading to a denial of service. This bug can be     only triggered with Apache HTTP Server version 2.4.37 when using OpenSSL version 1.1.1 or later, due to an     interaction in changes to handling of renegotiation attempts.

    CVE-2019-0196:
    A vulnerability was found in Apache HTTP Server 2.4.17 to 2.4.38. Using fuzzed network input, the http/2     request handling could be made to access freed memory in string comparison when determining the method of     a request and thus process the request incorrectly.

    CVE-2019-0197:
    A vulnerability was found in Apache HTTP Server 2.4.34 to 2.4.38. When HTTP/2 was enabled for a http: host     or H2Upgrade was enabled for h2 on a https: host, an Upgrade request from http/1.1 to http/2 that was not     the first request on a connection could lead to a misconfiguration and crash. Server that never enabled     the h2 protocol or that only enabled it for https: and did not set H2Upgrade on are unaffected by this     issue.

    CVE-2019-0211:
    In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in     less-privileged child processes or threads (including scripts executed by an in-process scripting     interpreter) could execute arbitrary code with the privileges of the parent process (usually root) by     manipulating the scoreboard. Non-Unix systems are not affected.

    CVE-2019-0215:
    In Apache HTTP Server 2.4 releases 2.4.37 and 2.4.38, a bug in mod_ssl when using per-location client     certificate verification with TLSv1.3 allowed a client to bypass configured access control restrictions.

    CVE-2019-0217:
    In Apache HTTP Server 2.4 release 2.4.38 and prior, a race condition in mod_auth_digest when running in a     threaded server could allow a user with valid credentials to authenticate using another username,     bypassing configured access control restrictions.

    CVE-2019-0220:
    A vulnerability was found in Apache HTTP Server 2.4.0 to 2.4.38. When the path component of a request URL     contains multiple consecutive slashes ('/'), directives such as LocationMatch and RewriteRule must account     for duplicates in regular expressions while other aspects of the servers processing will implicitly     collapse them.

    CVE-2019-10082:
    In Apache HTTP Server 2.4.18-2.4.39, using fuzzed network input, the http/2 session handling could be made     to read memory after being freed, during connection shutdown.

    CVE-2019-10092:
    In Apache HTTP Server 2.4.0-2.4.39, a limited cross-site scripting issue was reported affecting the     mod_proxy error page. An attacker could cause the link on the error page to be malformed and instead point     to a page of their choice. This would only be exploitable where a server was set up with proxying enabled     but was misconfigured in such a way that the Proxy Error page was displayed.

    CVE-2019-10097:
    In Apache HTTP Server 2.4.32-2.4.39, when mod_remoteip was configured to use a trusted intermediary proxy     server using the PROXY protocol, a specially crafted PROXY header could trigger a stack buffer overflow     or NULL pointer deference. This vulnerability could only be triggered by a trusted proxy and not by     untrusted HTTP clients.

    CVE-2019-10098:
    In Apache HTTP server 2.4.0 to 2.4.39, Redirects configured with mod_rewrite that were intended to be     self-referential might be fooled by encoded newlines and redirect instead to an unexpected URL within the     request URL.

    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-2019-9516:
    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-2019-9517:
    Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to     a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint;
    however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the     wire. The attacker then sends a stream of requests for a large response object. Depending on how the     servers queue the responses, this can consume excess memory, CPU, or both.

    CVE-2020-11984:
    Apache HTTP server 2.4.32 to 2.4.44 mod_proxy_uwsgi info disclosure and possible RCE

    CVE-2020-11993:
    Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on     certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent     use of memory pools. Configuring the LogLevel of mod_http2 above info will mitigate this vulnerability     for unpatched servers.

    CVE-2020-1927:
    In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be     self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within     the request URL.

    CVE-2020-1934:
    In Apache HTTP Server 2.4.0 to 2.4.41, mod_proxy_ftp may use uninitialized memory when proxying to a     malicious FTP server.

    CVE-2020-9490:
    Apache HTTP Server versions 2.4.20 to 2.4.43. A specially crafted value for the 'Cache-Digest' header in a     HTTP/2 request would result in a crash when the server actually tries to HTTP/2 PUSH a resource     afterwards. Configuring the HTTP/2 feature via H2Push off will mitigate this vulnerability for unpatched     servers.

    CVE-2021-26690:
    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-2021-30641:
    Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'

    CVE-2021-34798:
    Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP     Server 2.4.48 and earlier.

    CVE-2021-39275:
    ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules     pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache     HTTP Server 2.4.48 and earlier.

    CVE-2021-44790:
    A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser     (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the     vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and     earlier.

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
151010	FreeBSD : Apache httpd -- Multiple vulnerabilities (cce76eca-ca16-11eb-9b84-d4c9ef517024)	Nessus	FreeBSD Local Security Checks	2021/6/25	2023/12/12	critical
294360	MiracleLinux 8 : httpd:2.4 (AXSA:2021-2774:01)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	medium
294771	MiracleLinux 8 : httpd:2.4 (AXSA:2021-2541:01)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	critical
150876	SUSE SLES15: apache2 / apache2-devel / apache2-doc / apache2-prefork / etc (SUSE-SU-2021:2004-1)	Nessus	SuSE Local Security Checks	2021/6/21	2026/6/25	critical
150877	SUSE SLED12: apache2 / apache2-devel / apache2-doc / apache2-example-pages / etc (SUSE-SU-2021:2006-1)	Nessus	SuSE Local Security Checks	2021/6/21	2026/6/25	critical
150942	Ubuntu 16.04 ESM : Apache HTTP Server vulnerabilities (USN-4994-2)	Nessus	Ubuntu Local Security Checks	2021/6/21	2024/10/29	critical
155428	Oracle Linux 8 : httpd:2.4 (ELSA-2021-4257)	Nessus	Oracle Linux Local Security Checks	2021/11/17	2024/11/1	medium
151095	SUSE SLED15: apache2 / apache2-devel / apache2-doc / apache2-event / etc (SUSE-SU-2021:2127-1)	Nessus	SuSE Local Security Checks	2021/6/28	2026/6/25	critical
151522	Amazon Linux AMI : httpd24 (ALAS-2021-1514)	Nessus	Amazon Linux Local Security Checks	2021/7/13	2024/12/11	critical
170268	Oracle HTTP Server (Jan 2023 CPU)	Nessus	Web Servers	2023/1/23	2023/9/7	critical
314115	Unity Linux 20.1060e / 20.1070e Security Update: httpd (UTSA-2026-017605)	Nessus	Unity Linux Local Security Checks	2026/5/11	2026/5/11	medium
236421	Alibaba Cloud Linux 3 : 0017: httpd:2.4 (ALINUX3-SA-2022:0017)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/15	critical

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