The CentOS Linux 8.4 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS8.4:CLSA-2026:1778111838 advisory.

  - An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .htaccess     authors to read files with the privileges of the httpd user. Users are recommended to upgrade to version     2.4.67, which fixes this issue. (CVE-2026-24072)

  - Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects     to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause     it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache     HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.
    (CVE-2026-28780)

  - A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker     to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs.
    The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version     1.2.0. Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock.
    (CVE-2026-29169)

  - A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest     authentication by a remote attacker. Users are recommended to upgrade to version 2.4.67, which fixes this     issue. (CVE-2026-33006)

  - A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an     unauthenticated remote user to crash a child process in a caching forward proxy configuration. Users are     recommended to upgrade to version 2.4.67, which fixes this issue. (CVE-2026-33007)

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-2026:2103-1 advisory.

    This update for apache2 fixes the following issues

    - CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
    - CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
    - CVE-2026-28780: heap buffer overflow in `mod_proxy_ajp` via `ajp_msg_check_header()` (bsc#1264163).
    - CVE-2026-29168: allocation of resources without limits in `mod_md` via OCSP response (bsc#1264150).
    - CVE-2026-29169: NULL pointer dereference in `mod_dav_lock` allows server crash via malicious requests     (bsc#1263956).
    - CVE-2026-33006: `mod_auth_digest` timing attack allows bypass of Digest authentication (bsc#1263955).
    - CVE-2026-33007: NULL pointer dereference in `mod_authn_socache` allows unauthenticated remote user to     crash a child       processes (bsc#1263954).
    - CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
    - CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
    - CVE-2026-34032: heap buffer overread in `mod_proxy_ajp` due to missing null-termination check     (bsc#1263951).
    - CVE-2026-34059: heap buffer overread and memory disclosure via `ajp_parse_data()` (bsc#1263950).

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 SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2641-1 advisory.

    This update for apache2 fixes the following issues

    Update to 2.4.66 (jsc#PED-16334):

    Security issues:

    - CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
    - CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
    - CVE-2026-28780: heap buffer overflow in `mod_proxy_ajp` via `ajp_msg_check_header()` (bsc#1264163).
    - CVE-2026-29168: allocation of resources without limits in `mod_md` via OCSP response (bsc#1264150).
    - CVE-2026-29169: NULL pointer dereference in `mod_dav_lock` allows server crash via malicious requests     (bsc#1263956).
    - CVE-2026-33006: `mod_auth_digest` timing attack allows bypass of Digest authentication (bsc#1263955).
    - CVE-2026-33007: NULL pointer dereference in `mod_authn_socache` allows unauthenticated remote user to     crash a child       processes (bsc#1263954).
    - CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
    - CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
    - CVE-2026-34032: heap buffer overread in `mod_proxy_ajp` due to missing null-termination check     (bsc#1263951).
    - CVE-2026-34059: heap buffer overread and memory disclosure via `ajp_parse_data()` (bsc#1263950).

    Non security issue:

    - Internal server error on very long URL (bsc#690734).

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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised     backend servers. This issue affects Apache HTTP Server: from through 2.4.66. Users are recommended to     upgrade to version 2.4.67, which fixes the issue. (CVE-2026-33523)

Note that Nessus relies on the presence of the package as reported by the vendor.

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

    Improper Null Termination, Out-of-bounds Read vulnerability in Apache HTTP Server.This issue affects     Apache HTTP Server: through 2.4.66.Users are recommended to upgrade to version 2.4.67, which fixes the     issue.(CVE-2026-34032)

    Out-of-bounds Read vulnerability in mod_proxy_ajp of Apache HTTP Server.This issue affects Apache HTTP     Server: through 2.4.66.Users are recommended to upgrade to version 2.4.67, which fixes the     issue.(CVE-2026-33857)

    A vulnerability was found in Apache HTTP Server up to 2.4.67 (Web Server) and classified as critical.Using     CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the     buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the     buffer was allocated using a routine such as malloc().Impacted is confidentiality, integrity, and     availability.Upgrading to version 2.4.68 eliminates this vulnerability.(CVE-2026-42536)

    A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to     directly manipulate trusted DAV property databases, potentially causing child process crashes.Users are     recommended to upgrade to version 2.4.68, which fixes this issue.(CVE-2026-42535)

    Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the     configuration.This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.Users are recommended to     upgrade to version 2.4.68, which fixes the issue.(CVE-2026-44631)

    Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled     OCSP server.This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.Users are recommended to     upgrade to version 2.4.68, which fixes the issue.(CVE-2026-44185)

    HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised     backend servers.This issue affects Apache HTTP Server: from through 2.4.66.Users are recommended to     upgrade to version 2.4.67, which fixes the issue.(CVE-2026-33523)

    Improper Privilege Management vulnerability in Apache HTTP Server 2.4.67 and earlier allows local     .htaccess authors to read files with the privileges of the httpd user.This issue affects Apache HTTP     Server: from through 2.4.67.Users are recommended to upgrade to version 2.4.68, which fixes the     issue.(CVE-2026-44119)

    Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and     ProxyPassReverseCookie* This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.Users are     recommended to upgrade to version 2.4.68, which fixes the issue.(CVE-2026-34356)

    A cross-site scripting vulnerability exists in mod_proxy_ftp's HTML directory list generation in Apache     HTTP Server 2.4.67 and earlier when listing FTP directory contents either via forward or reverse proxy     configuration.Users are recommended to upgrade to version 2.4.68, which fixes this issue.(CVE-2026-29170)

    Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache     HTTP Server with an attacker controlled backend FTP server.This issue affects undefined: from 2.4.0     through 2.4.67.Users are recommended to upgrade to version 2.4.68, which fixes the issue.(CVE-2026-44186)

    Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response     languages.This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.(CVE-2026-43951)

    A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an     unauthenticated remote user to crash a child process in a caching forward proxy configuration.Users are     recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-33007)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization httpd security advisory.

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 httpd packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker     to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or     mod_dav_fs._x000D_
    _x000D_     The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version     1.2.0._x000D_
    _x000D_     Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove     mod_dav_lock.(CVE-2026-29169)

    HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised     backend servers._x000D_
    _x000D_     This issue affects Apache HTTP Server: from through 2.4.66._x000D_
    _x000D_     Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-33523)

    A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an     unauthenticated remote user to crash a child process in a caching forward proxy configuration._x000D_
    _x000D_     Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-33007)

    Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's   mod_md via     OCSP response data._x000D_
    _x000D_     This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66._x000D_
    _x000D_     Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-29168)

    Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server._x000D_     If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back     to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based     buffer._x000D_
    _x000D_     This issue affects Apache HTTP Server: through 2.4.66._x000D_
    _x000D_     Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-28780)

    An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .htaccess     authors to read files with the privileges of the httpd user._x000D_
    _x000D_     Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-24072)

    A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest     authentication by a remote attacker._x000D_
    _x000D_     Users are recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-33006)

    Buffer Over-read vulnerability in Apache HTTP Server._x000D_
    _x000D_     This issue affects Apache HTTP Server: through 2.4.66._x000D_
    _x000D_     Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-34059)

    Out-of-bounds Read vulnerability in mod_proxy_ajp of _x000D_
    _x000D_     Apache HTTP Server._x000D_
    _x000D_     This issue affects Apache HTTP Server: through 2.4.66._x000D_
    _x000D_     Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-33857)

    Improper Null Termination, Out-of-bounds Read vulnerability in Apache HTTP Server._x000D_
    _x000D_     This issue affects Apache HTTP Server: through 2.4.66._x000D_
    _x000D_     Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-34032)

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

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 httpd packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    Improper Null Termination, Out-of-bounds Read vulnerability in Apache HTTP Server.This issue affects     Apache HTTP Server: through 2.4.66.Users are recommended to upgrade to version 2.4.67, which fixes the     issue.(CVE-2026-34032)

    A flaw was found in the `mod_dav_fs` module of Apache HTTP Server. A WebDAV (Web Distributed Authoring and     Versioning) content author could exploit a path handling issue to directly manipulate trusted DAV property     databases. This manipulation could potentially lead to child process crashes, resulting in a Denial of     Service (DoS).(CVE-2026-42535)

    Out-of-bounds Read vulnerability in mod_proxy_ajp of Apache HTTP Server.This issue affects Apache HTTP     Server: through 2.4.66.Users are recommended to upgrade to version 2.4.67, which fixes the     issue.(CVE-2026-33857)

    Buffer Over-read vulnerability in Apache HTTP Server.This issue affects Apache HTTP Server: through     2.4.66.Users are recommended to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-34059)

    Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and     untrusted content This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.Users are recommended     to upgrade to version 2.4.68, which fixes the issue.(CVE-2026-42536)

    Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled     OCSP server This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.Users are recommended to     upgrade to version 2.4.68, which fixes the issue.(CVE-2026-44185)

    Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the     configuration.This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.Users are recommended to     upgrade to version 2.4.68, which fixes the issue.(CVE-2026-44631)

    Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server.If mod_proxy_ajp connects     to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause     it to write 4 attacker controlled bytes after the end of a heap based buffer.This issue affects Apache     HTTP Server: through 2.4.66.Users are recommended to upgrade to version 2.4.67, which fixes the     issue.(CVE-2026-28780)

    HTTP response splitting vulnerability in multiple Apache HTTP Server modules with untrusted or compromised     backend servers.This issue affects Apache HTTP Server: from through 2.4.66.Users are recommended to     upgrade to version 2.4.67, which fixes the issue.(CVE-2026-33523)

    A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker     to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or     mod_dav_fs.The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than     version 1.2.0.Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove     mod_dav_lock.(CVE-2026-29169)

    Improper Privilege Management vulnerability in Apache HTTP Server 2.4.67 and earlier allows local     .htaccess authors to read files with the privileges of the httpd user.This issue affects Apache HTTP     Server: from through 2.4.67.Users are recommended to upgrade to version 2.4.68, which fixes the     issue.(CVE-2026-44119)

    A cross-site scripting vulnerability exists in mod_proxy_ftp's HTML directory list generation in Apache     HTTP Server 2.4.67 and earlier when listing FTP directory contents either via forward or reverse proxy     configuration.Users are recommended to upgrade to version 2.4.68, which fixes this issue.(CVE-2026-29170)

    Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and     ProxyPassReverseCookie* This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.Users are     recommended to upgrade to version 2.4.68, which fixes the issue.(CVE-2026-34356)

    A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest     authentication by a remote attacker.Users are recommended to upgrade to version 2.4.67, which fixes this     issue.(CVE-2026-33006)

    Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response     languages.This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.(CVE-2026-43951)

    Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache     HTTP Server with an attacker controlled backend FTP server.This issue affects undefined: from 2.4.0     through 2.4.67.Users are recommended to upgrade to version 2.4.68, which fixes the issue.(CVE-2026-44186)

    An escalation of privilege bug in various modules in Apache HTTP 2.4.66 and earlier allows local .htaccess     authors to read files with the privileges of the httpd user.Users are recommended to upgrade to version     2.4.67, which fixes this issue.(CVE-2026-24072)

    Allocation of Resources Without Limits or Throttling vulnerability in Apache HTTP Server's   mod_md via     OCSP response data.This issue affects Apache HTTP Server: from 2.4.30 through 2.4.66.Users are recommended     to upgrade to version 2.4.67, which fixes the issue.(CVE-2026-29168)

    A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an     unauthenticated remote user to crash a child process in a caching forward proxy configuration.Users are     recommended to upgrade to version 2.4.67, which fixes this issue.(CVE-2026-33007)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization httpd 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 Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4571 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4571-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                   Bastien Roucaris     May 08, 2026                                  https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : apache2     Version        : 2.4.67-1~deb11u1     CVE ID         : CVE-2026-24072 CVE-2026-28780 CVE-2026-29168 CVE-2026-29169                      CVE-2026-33006 CVE-2026-33007 CVE-2026-33523 CVE-2026-33857                      CVE-2026-34032 CVE-2026-34059     Debian Bug     : 1135737

    Multiple vulnerabilities have been discovered in the Apache HTTP server,     which may result in remote code execution, privilege escalation, denial     of service or information disclosure.

    An erratum was issued because DLA??4571??1 incorrectly marked CVE??2026??28780     and CVE??2026??29168 as not fixed.

    These two vulnerabilities are in fact addressed in version 2.4.67??1~deb11u1,     which includes the required security fixes.

    Additionally, CVE??2026??23918 was marked as not affecting Bullseye, as the     vulnerable code is not present in any previously released Bullseye packages.
    However, the updated package includes the fix for this issue as well,     even though it does not impact this release.

    For Debian 11 bullseye, these problems have been fixed in version     2.4.67-1~deb11u1.

    We recommend that you upgrade your apache2 packages.

    For the detailed security status of apache2 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/apache2

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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 host is affected by the vulnerability described in GLSA-202608-05 (Apache HTTPD: Multiple Vulnerabilities)

    Multiple vulnerabilities have been discovered in Apache HTTPD. Please review the CVE identifiers     referenced below for details.

Tenable has extracted the preceding description block directly from the Gentoo 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	Name	Product	Family	Published	Updated	Severity
361832	CentOS Linux 8.4 [TuxCare] Security Update: httpd / httpd-devel / httpd-filesystem / httpd-manual / httpd-tools / etc Multiple Vulnerabilities (CENTOS8.4:CLSA-2026:1778111838)	Nessus	CentOS Local Security Checks	10/1/2026	10/1/2026	high
317656	SUSE SLES15 Security Update : apache2 (SUSE-SU-2026:2103-1)	Nessus	SuSE Local Security Checks	5/29/2026	9/29/2026	high
323050	SUSE SLES12: apache2 / apache2-devel / apache2-doc / apache2-example-pages / etc (SUSE-SU-2026:2641-1)	Nessus	SuSE Local Security Checks	6/26/2026	8/29/2026	high
312240	Linux Distros Unpatched Vulnerability : CVE-2026-33523	Nessus	Misc.	5/5/2026	11/6/2026	medium
347072	EulerOS Virtualization 2.12.0 : httpd (EulerOS-SA-2026-3643)	Nessus	Huawei Local Security Checks	9/18/2026	9/18/2026	critical
332852	EulerOS 2.0 SP15 : httpd (EulerOS-SA-2026-2929)	Nessus	Huawei Local Security Checks	8/6/2026	8/6/2026	high
339284	EulerOS Virtualization 2.13.1 : httpd (EulerOS-SA-2026-3175)	Nessus	Huawei Local Security Checks	8/25/2026	8/25/2026	critical
313221	Debian dla-4571 : apache2 - security update	Nessus	Debian Local Security Checks	5/8/2026	5/14/2026	critical
335265	GLSA-202608-05 : Apache HTTPD: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	8/13/2026	8/17/2026	high

Detections

Analytics

Plugins Search

high

high

high

medium

critical

high

critical

critical

high