ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Versions prior to 2.9.10 contain a denial of service vulnerability similar to GHSA-859r-vvv8-rm8r/CVE-2025-47947. The `sanitiseArg` (and `sanitizeArg` - this is the same action but an alias) is vulnerable to adding an excessive number of arguments, thereby leading to denial of service. Version 2.9.10 fixes the issue. As a workaround, avoid using rules that contain the `sanitiseArg` (or `sanitizeArg`) action.

The remote SUSE Linux SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02029-1 advisory.

    - CVE-2025-47947: Fixed denial of service through sanitiseMatchedBytes (bsc#1243978).
    - CVE-2025-48866: Fixed denial of service via excessive number of arguments in sanitiseArg (bsc#1243976).

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 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02052-1 advisory.

    - CVE-2025-47947: Fixed denial of service through sanitiseMatchedBytes (bsc#1243978).
    - CVE-2025-48866: Fixed denial of service via excessive number of arguments in sanitiseArg (bsc#1243976).

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 SLES15 / SLES_SAP15 / openSUSE 15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02028-1 advisory.

    - CVE-2025-47947: Fixed denial of service through sanitiseMatchedBytes (bsc#1243978).
    - CVE-2025-48866: Fixed denial of service via excessive number of arguments in sanitiseArg (bsc#1243976).

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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2025-1026 advisory.

    ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and     Nginx. Versions up to and including 2.9.8 are vulnerable to denial of service in one special case (in     stable released versions): when the payload's content type is `application/json`, and there is at least     one rule which does a `sanitiseMatchedBytes` action. A patch is available at pull request 3389 and     expected to be part of version 2.9.9. No known workarounds are available. (CVE-2025-47947)

    ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and     Nginx. Versions prior to 2.9.10 contain a denial of service vulnerability similar to     GHSA-859r-vvv8-rm8r/CVE-2025-47947. The `sanitiseArg` (and `sanitizeArg` - this is the same action but an     alias) is vulnerable to adding an excessive number of arguments, thereby leading to denial of service.
    Version 2.9.10 fixes the issue. As a workaround, avoid using rules that contain the  `sanitiseArg` (or     `sanitizeArg`) action. (CVE-2025-48866)

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 remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 / 25.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7567-1 advisory.

    Simon Studer discovered that ModSecurity incorrectly handled certain JSON objects. An attacker could     possibly use this issue to cause a denial of service. (CVE-2025-47947)

    It was discovered that ModSecurity incorrectly handled requests when parsing certain form data. An     attacker could possibly use this issue to cause a denial of service. (CVE-2025-48866)

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 mod_security installed on the remote host is prior to 2.9.10-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2025-2887 advisory.

    ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and     Nginx. Versions up to and including 2.9.8 are vulnerable to denial of service in one special case (in     stable released versions): when the payload's content type is `application/json`, and there is at least     one rule which does a `sanitiseMatchedBytes` action. A patch is available at pull request 3389 and     expected to be part of version 2.9.9. No known workarounds are available. (CVE-2025-47947)

    ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and     Nginx. Versions prior to 2.9.10 contain a denial of service vulnerability similar to     GHSA-859r-vvv8-rm8r/CVE-2025-47947. The `sanitiseArg` (and `sanitizeArg` - this is the same action but an     alias) is vulnerable to adding an excessive number of arguments, thereby leading to denial of service.
    Version 2.9.10 fixes the issue. As a workaround, avoid using rules that contain the  `sanitiseArg` (or     `sanitizeArg`) action. (CVE-2025-48866)

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 remote Debian 11 host has a package installed that is affected by a vulnerability as referenced in the dla-4212 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4212-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                          Adrian Bunk     June 09, 2025                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : modsecurity-apache     Version        : 2.9.3-3+deb11u4     CVE ID         : CVE-2025-48866     Debian Bug     : 1107196

    DoS with sanitiseArg/sanitizeArg 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+deb11u4.

    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 remote Debian 12 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-5940 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-5940-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     June 08, 2025                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : modsecurity-apache     CVE ID         : CVE-2025-47947 CVE-2025-48866     Debian Bug     : 1106286 1107196

    Several vulnerabilities were discovered in modsecurity-apache, an Apache     module to tighten the Web application security, which may result in     denial of service (high memory consumption).

    For the stable distribution (bookworm), these problems have been fixed in     version 2.9.7-1+deb12u1.

    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 Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

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 fa1d42c8-42fe-11f0-a9fa-b42e991fc52e advisory.

    security-advisories@github.com reports:

                    ModSecurity is an open source, cross platform web                     application firewall (WAF) engine for Apache, IIS                     and Nginx. Versions prior to 2.9.10 contain a denial of                     service vulnerability similar to                     GHSA-859r-vvv8-rm8r/CVE-2025-47947. The `sanitiseArg`                     (and `sanitizeArg` - this is the same action but an                     alias) is vulnerable to adding an excessive number                     of arguments, thereby leading to denial of service.
                    Version 2.9.10 fixes the issue. As a workaround, avoid                     using rules that contain the `sanitiseArg` (or                     `sanitizeArg`) action.


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.

ID	Name	Product	Family	Severity
240806	SUSE SLES15 Security Update : apache2-mod_security2 (SUSE-SU-2025:02029-1)	Nessus	SuSE Local Security Checks	high
240613	SUSE SLES12 Security Update : apache2-mod_security2 (SUSE-SU-2025:02052-1)	Nessus	SuSE Local Security Checks	high
240543	SUSE SLES15 / openSUSE 15 Security Update : apache2-mod_security2 (SUSE-SU-2025:02028-1)	Nessus	SuSE Local Security Checks	high
240298	Amazon Linux 2023 : mod_security, mod_security-mlogc (ALAS2023-2025-1026)	Nessus	Amazon Linux Local Security Checks	high
240061	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 / 25.04 : ModSecurity vulnerabilities (USN-7567-1)	Nessus	Ubuntu Local Security Checks	high
238359	Amazon Linux 2 : mod_security (ALAS-2025-2887)	Nessus	Amazon Linux Local Security Checks	high
238024	Debian dla-4212 : libapache2-mod-security2 - security update	Nessus	Debian Local Security Checks	high
237954	Debian dsa-5940 : libapache2-mod-security2 - security update	Nessus	Debian Local Security Checks	high
237929	FreeBSD : ModSecurity -- possible DoS vulnerability (fa1d42c8-42fe-11f0-a9fa-b42e991fc52e)	Nessus	FreeBSD Local Security Checks	high

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CVE-2025-48866

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