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.

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 Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:8674 advisory.

    ModSecurity is an open source intrusion detection and prevention engine for web applications.

    Security Fix(es):

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:8844 advisory.

    ModSecurity is an open source intrusion detection and prevention engine for web applications.

    Security Fix(es):

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:8837 advisory.

    ModSecurity is an open source intrusion detection and prevention engine for web applications.

    Security Fix(es):

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:8922 advisory.

    ModSecurity is an open source intrusion detection and prevention engine for web applications.

    Security Fix(es):

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:8917 advisory.

    ModSecurity is an open source intrusion detection and prevention engine for web applications.

    Security Fix(es):

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 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 Alibaba Cloud Linux 3 host has packages installed that are affected by a vulnerability as referenced in the ALINUX3-SA-2025:0089 advisory.

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

    CVE-2025-47947:
    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.

Tenable has extracted the preceding description block directly from the Alibaba Cloud 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 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 AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2025:8844 advisory.

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 AlmaLinux 9 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2025:8837 advisory.

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2025-8844 advisory.

    - add fix for CVE-2025-47947

Tenable has extracted the preceding description block directly from the Oracle 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 Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2025-8837 advisory.

    - add fix for CVE-2025-47947

Tenable has extracted the preceding description block directly from the Oracle 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 Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:8937 advisory.

    ModSecurity is an open source intrusion detection and prevention engine for web applications.

    Security Fix(es):

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:8626 advisory.

    ModSecurity is an open source intrusion detection and prevention engine for web applications.

    Security Fix(es):

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:8627 advisory.

    ModSecurity is an open source intrusion detection and prevention engine for web applications.

    Security Fix(es):

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 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 remote Fedora 41 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-719f4a7313 advisory.

    This update includes `mod_security` version **2.9.9** which addresses `CVE-2025-47947` and includes     various bug fixes. See https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.9 for more     information on the changes in this release.



Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-7faa0bc6e5 advisory.

    This update includes `mod_security` version **2.9.9** which addresses `CVE-2025-47947` and includes     various bug fixes. See https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.9 for more     information on the changes in this release.



Tenable has extracted the preceding description block directly from the Fedora 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 FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the ecea70d2-42fe-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 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.

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 remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:8605 advisory.

    ModSecurity is an open source intrusion detection and prevention engine for web applications.

    Security Fix(es):

    * modsecurity: ModSecurity Has Possible DoS Vulnerability (CVE-2025-47947)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the a372abb0-3d3c-11f0-86e7-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 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.

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
240686	RHEL 8 : mod_security (RHSA-2025:8674)	Nessus	Red Hat Local Security Checks	high
240674	RHEL 8 : mod_security (RHSA-2025:8844)	Nessus	Red Hat Local Security Checks	high
240672	RHEL 9 : mod_security (RHSA-2025:8837)	Nessus	Red Hat Local Security Checks	high
240661	RHEL 9 : mod_security (RHSA-2025:8922)	Nessus	Red Hat Local Security Checks	high
240659	RHEL 9 : mod_security (RHSA-2025:8917)	Nessus	Red Hat 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
240120	Alibaba Cloud Linux 3 : 0089: mod_security (ALINUX3-SA-2025:0089)	Nessus	Alibaba Cloud 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
238347	AlmaLinux 8 : mod_security (ALSA-2025:8844)	Nessus	Alma Linux Local Security Checks	high
238345	AlmaLinux 9 : mod_security (ALSA-2025:8837)	Nessus	Alma Linux Local Security Checks	high
238324	Oracle Linux 8 : mod_ (ELSA-2025-8844)	Nessus	Oracle Linux Local Security Checks	high
238293	Oracle Linux 9 : mod_ (ELSA-2025-8837)	Nessus	Oracle Linux Local Security Checks	high
238250	RHEL 9 : mod_security (RHSA-2025:8937)	Nessus	Red Hat Local Security Checks	high
237964	RHEL 8 : mod_security (RHSA-2025:8626)	Nessus	Red Hat Local Security Checks	high
237962	RHEL 8 : mod_security (RHSA-2025:8627)	Nessus	Red Hat Local Security Checks	high
237954	Debian dsa-5940 : libapache2-mod-security2 - security update	Nessus	Debian Local Security Checks	high
237931	Fedora 41 : mod_security (2025-719f4a7313)	Nessus	Fedora Local Security Checks	high
237926	Fedora 42 : mod_security (2025-7faa0bc6e5)	Nessus	Fedora Local Security Checks	high
237925	FreeBSD : ModSecurity -- possible DoS vulnerability (ecea70d2-42fe-11f0-a9fa-b42e991fc52e)	Nessus	FreeBSD Local Security Checks	high
237803	RHEL 8 : mod_security (RHSA-2025:8605)	Nessus	Red Hat Local Security Checks	high
237607	FreeBSD : ModSecurity -- Possible DoS Vulnerability (a372abb0-3d3c-11f0-86e7-b42e991fc52e)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2025-47947

high

Tenable Plugins

high

high

high

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