ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. In versions 2.9.11 and below, an attacker can override the HTTP response’s Content-Type, which could lead to several issues depending on the HTTP scenario. For example, we have demonstrated the potential for XSS and arbitrary script source code disclosure in the latest version of mod_security2. This issue is fixed in version 2.9.12.

The remote Debian 11 host has a package installed that is affected by a vulnerability as referenced in the dla-4294 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4294-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                          Adrian Bunk     September 07, 2025                            https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : modsecurity-apache     Version        : 2.9.3-3+deb11u5     CVE ID         : CVE-2025-54571     Debian Bug     : 1110480

    Cross-site scripting due to insufficient return value handling has been     fixed in modsecurity-apache, a module for the Apache webserver to     tighten Web application security.

    For Debian 11 bullseye, this problem has been fixed in version     2.9.3-3+deb11u5.

    We recommend that you upgrade your modsecurity-apache packages.

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

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

The version of mod_security installed on the remote host is prior to 2.9.12-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2025-2981 advisory.

    ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and     Nginx. In versions 2.9.11 and below, an attacker can override the HTTP response's Content-Type, which     could lead to several issues depending on the HTTP scenario. For example, we have demonstrated the     potential for XSS and arbitrary script source code disclosure in the latest version of mod_security2. This     issue is fixed in version 2.9.12. (CVE-2025-54571)

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

  - ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and     Nginx. In versions 2.9.11 and below, an attacker can override the HTTP response's Content-Type, which     could lead to several issues depending on the HTTP scenario. For example, we have demonstrated the     potential for XSS and arbitrary script source code disclosure in the latest version of mod_security2. This     issue is fixed in version 2.9.12. (CVE-2025-54571)

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

ID	Name	Product	Family	Severity
261662	Debian dla-4294 : libapache2-mod-security2 - security update	Nessus	Debian Local Security Checks	medium
261337	Amazon Linux 2 : mod_security, --advisory ALAS2-2025-2981 (ALAS-2025-2981)	Nessus	Amazon Linux Local Security Checks	medium
253373	Linux Distros Unpatched Vulnerability : CVE-2025-54571	Nessus	Misc.	medium

Detections

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CVE-2025-54571

medium

Tenable Plugins

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medium

medium