A bug in Apache HTTP Server 2.4.64 results in all "RewriteCond expr ..." tests evaluating as "true". Users are recommended to upgrade to version 2.4.65, which fixes the issue.

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

  - A bug in Apache HTTP Server 2.4.64 results in all RewriteCond expr ... tests evaluating as true. Users     are recommended to upgrade to version 2.4.65, which fixes the issue. (CVE-2025-54090)

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

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4270 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4270-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                   Bastien Roucaris     August 12, 2025                               https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : apache2     Version        : 2.4.65-1~deb11u1     CVE ID         : CVE-2024-42516 CVE-2024-43204 CVE-2024-43394 CVE-2024-47252                      CVE-2025-23048 CVE-2025-49630 CVE-2025-49812 CVE-2025-53020                      CVE-2025-54090

    Multiple vulnerabilities have been addressed in Apache,     a widely used web server.

    Please note that the fix for CVE-2025-23048, included in this DLA,     may cause some SSL-enabled websites to encounter the error AH02032.
    Additional details are provided at the end of this advisory.

    CVE-2024-42516

        HTTP response splitting in the core of Apache HTTP Server allows an         attacker who can manipulate the Content-Type response headers of         applications hosted or proxied by the server can split the HTTP response

    CVE-2024-43204

        A SSRF (Server Side Request Forgery) was found in Apache HTTP Server         with mod_proxy loaded allows an attacker to         send outbound proxy requests to a URL controlled by the attacker.
        This attack requires an unlikely configuration where mod_headers         is configured to modify the Content-Type request or response header with a         value provided in the HTTP request

    CVE-2024-43394

        A Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows         allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite         or apache expressions that pass unvalidated request input.

    CVE-2024-47252

        Insufficient escaping of user-supplied data in mod_ssl allows an untrusted         SSL/TLS client to insert escape characters into log files in some         configurations. In a logging configuration where CustomLog is used with         %{varname}x or %{varname}c to log variables provided by mod_ssl such as         SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and         unsanitized data provided by the client may appear in log files.

    CVE-2025-23048

        An access control bypass by trusted clients is possible using TLS 1.3         session resumption. Configurations are affected when mod_ssl is         configured for multiple virtual hosts, with each restricted to a         different set of trusted client certificates         (for example with a different SSLCACertificateFile/Path setting).
        In such a case, a client trusted to access one virtual host may be able to         access another virtual host, if SSLStrictSNIVHostCheck is not enabled         in either virtual host.

    CVE-2025-49630

        In certain proxy configurations, a denial of service attack against         Apache HTTP Server can be triggered by untrusted clients causing         an assertion in mod_proxy_http2. Configurations affected are a         reverse proxy is configured for an HTTP/2 backend, with         ProxyPreserveHost set to on.

    CVE-2025-49812

        In some mod_ssl configurations on Apache HTTP server, an HTTP         desynchronisation attack allows a man-in-the-middle attacker         to hijack an HTTP session via a TLS upgrade. Only configurations         using SSLEngine optional to enable TLS upgrades are affected.
        Support for TLS upgrade was removed.

    CVE-2025-53020

        A late Release of Memory after Effective Lifetime vulnerability         was found in Apache HTTP Server.

    CVE-2025-54090

        A bug in Apache HTTP Server 2.4.64 results in all         RewriteCond expr ... tests evaluating as true

    For Debian 11 bullseye, these problems have been fixed in version     2.4.65-1~deb11u1.

    Note that following the resolution of CVE-2025-23048,     some SSL-enabled websites may begin encountering     the error (AH02032):

        Misdirected Request:
        The client needs a new connection for this request as the         requested host name does not match the Server Name Indication         (SNI) in use for this connection.

    This behavior is particularly noticeable with AWS Application     Load Balancers. Although they support intelligent SNI handling,     they do not (as of this writing) relay SNI data to the target     server, resulting in failed connections when hostnames don??t align.

    Without an SNI provided by the client, there is nothing httpd     can do to determine which vhost/configuration should be     used to provide the correct certificate (and TLS authentication     eventually) whenever multiple vhosts listen on the same IP:port.

    That's because reading the HTTP Host header necessarily has to     happen after the TLS handshake/auth/decryption (and later     renegotiation is not an option with TLSv1.3).

    So those connections fall back to the first vhost declared on     the IP:port for the TLS handshake part, and if the request     Host header finally matches a different vhost with a different     TLS configuration it's rejected with AH02032.

    Before 2.4.64 the check was not accurate and would allow that,     with security implications.

    As a workaround, you may (after a risk analysis) generate a     wildcard certificate. If you??re managing multiple domains,     consolidate them into a single certificate by including each     wildcard domain as an alias. Then, update the Apache configuration     to reference this unified certificate.

    Another possible workaround is to configure each virtual host to     listen on a separate port. This approach avoids SNI-related issues     by ensuring that each vhost is uniquely addressed through its own     connection endpoint, thereby allowing distinct TLS configurations     without ambiguity.

    This error may also stem from a misconfigured HAProxy setup.
    In such cases, enabling dynamic SNI handling on HAProxy might be     necessary to ensure that the correct hostname is passed through     during the TLS handshake. After risk analysis, it could be done     by using sni req.hdr(Host) directive.

    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 version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the fb08d146-752a-11f0-952c-8447094a420f advisory.

    The Apache httpd project reports:
    'RewriteCond expr' always evaluates to true in 2.4.64.

Tenable has extracted the preceding description block directly from the FreeBSD 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 httpd installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-54090 advisory.

  - A bug in Apache HTTP Server 2.4.64 results in all RewriteCond expr ... tests evaluating as true. Users     are recommended to upgrade to version 2.4.65, which fixes the issue. (CVE-2025-54090)

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 httpd installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-54090 advisory.

  - A bug in Apache HTTP Server 2.4.64 results in all RewriteCond expr ... tests evaluating as true. Users     are recommended to upgrade to version 2.4.65, which fixes the issue. (CVE-2025-54090)

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

According to its banner, the version of Apache running on the remote host is 2.4.64. It is, therefore, affected by a bug which results in all "RewriteCond expr ..." tests evaluating as "true".

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

The version of Apache httpd installed on the remote host is prior to 2.4.65. It is, therefore, affected by a vulnerability as referenced in the 2.4.65 advisory.

  - A bug in Apache HTTP Server 2.4.64 results in all RewriteCond expr ... tests evaluating as true. Users     are recommended to upgrade to version 2.4.65, which fixes the issue. (CVE-2025-54090)

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

ID	Name	Product	Family	Severity
249543	Linux Distros Unpatched Vulnerability : CVE-2025-54090	Nessus	Misc.	medium
249166	Debian dla-4270 : apache2 - security update	Nessus	Debian Local Security Checks	critical
247130	FreeBSD : Apache httpd -- evaluation always true (fb08d146-752a-11f0-952c-8447094a420f)	Nessus	FreeBSD Local Security Checks	medium
245587	CBL Mariner 2.0 Security Update: httpd (CVE-2025-54090)	Nessus	MarinerOS Local Security Checks	medium
245586	Azure Linux 3.0 Security Update: httpd (CVE-2025-54090)	Nessus	Azure Linux Local Security Checks	medium
114924	Apache 2.4.64 RewriteCond expr Vulnerability	Web App Scanning	Component Vulnerability	medium
242629	Apache 2.4.x < 2.4.65	Nessus	Web Servers	medium

Detections

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CVE-2025-54090

medium

Tenable Plugins

medium

critical

medium

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medium

medium

medium