# CVE-2025-47947: libapache2-mod-security2: ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx CVE-2025-47947 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2025-47947, released May 21, 2025. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2025-47947 - Priority: High - CVSS: 7.5 (Medium) - EPSS: 0.0060 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 21, 2025 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | apache2-mod_security2 opensuse-leap 15.6 | 2.9.4-150400.3.9.1 | [SUSE-SU-2025:02028-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02028-1.md) | Jun 19, 2025 | | Linux | apache2-mod_security2 sles 15.6 | 2.9.4-150400.3.9.1 | [SUSE-SU-2025:02028-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02028-1.md) | Jun 19, 2025 | | Linux | apache2-mod_security2 sles 15.7 | 2.9.4-150400.3.9.1 | [SUSE-SU-2025:02028-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02028-1.md) | Jun 19, 2025 | | Linux | libapache2-mod-security2 Ubuntu 18.04.6 LTS (bionic) | 2.9.2-1ubuntu0.1~esm2 | [libapache2-mod-security2 2.9.2-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libapache2-mod-security2-2.9.2-1ubuntu0.1-esm2.md) | Jun 2, 2025 | | Linux | libapache2-mod-security2 Ubuntu 20.04 LTS (focal) | 2.9.3-1ubuntu0.1+esm1 | [libapache2-mod-security2 2.9.3-1ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libapache2-mod-security2-2.9.3-1ubuntu0.1-esm1.md) | Jun 2, 2025 | | Linux | libapache2-mod-security2 Ubuntu 22.04.1 LTS (jammy) | 2.9.5-1ubuntu0.1~esm2 | [libapache2-mod-security2 2.9.5-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libapache2-mod-security2-2.9.5-1ubuntu0.1-esm2.md) | Jun 2, 2025 | | Linux | libapache2-mod-security2 Ubuntu 24.04.5 LTS (noble) | 2.9.7-1ubuntu0.24.04.1~esm1 | [libapache2-mod-security2 2.9.7-1ubuntu0.24.04.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libapache2-mod-security2-2.9.7-1ubuntu0.24.04.1-esm1.md) | Jun 2, 2025 | | Linux | libapache2-mod-security2 Ubuntu 24.10 (oracular) | 2.9.7-1ubuntu0.24.10.1 | [libapache2-mod-security2 2.9.7-1ubuntu0.24.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libapache2-mod-security2-2.9.7-1ubuntu0.24.10.1.md) | Jan 16, 2026 | | Linux | libapache2-mod-security2 Ubuntu 25.04 (plucky) | 2.9.8-1.1ubuntu0.1 | [libapache2-mod-security2 2.9.8-1.1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libapache2-mod-security2-2.9.8-1.1ubuntu0.1.md) | Jan 16, 2026 | | Linux | mod_security RHEL 8 | 0:2.9.6-2.el8_10 | [RHSA-2025:8844](https://patchblox.com/security/data/fix/linux/rhsa-2025-8844.md) | Jun 11, 2025 | | Linux | mod_security RHEL 9 | 0:2.9.6-2.el9_6 | [RHSA-2025:8837](https://patchblox.com/security/data/fix/linux/rhsa-2025-8837.md) | Jun 11, 2025 | | Linux | mod_security almalinux 8 | 2.9.6-2.el8_10 | [ALSA-2025:8844](https://patchblox.com/security/data/fix/linux/alsa-2025-8844.md) | Jun 11, 2025 | | Linux | mod_security almalinux 9 | 2.9.6-2.el9_6 | [ALSA-2025:8837](https://patchblox.com/security/data/fix/linux/alsa-2025-8837.md) | Jun 11, 2025 | | Linux | mod_security amzn 2023 | 2.9.10-1.amzn2023.0.1 | [ALAS2023-2025-1026](https://patchblox.com/security/data/fix/linux/alas2023-2025-1026.md) | Jun 18, 2025 | | Linux | mod_security ol 8 | 0:2.9.6-2.el8_10 | [ELSA-2025-8844](https://patchblox.com/security/data/fix/linux/elsa-2025-8844.md) | Jun 11, 2025 | | Linux | mod_security ol 9 | 0:2.9.6-2.el9_6 | [ELSA-2025-8837](https://patchblox.com/security/data/fix/linux/elsa-2025-8837.md) | Jun 11, 2025 | | Linux | mod_security rocky 8 | 0:2.9.6-2.el8_10 | [RLSA-2025:8844](https://patchblox.com/security/data/fix/linux/rlsa-2025-8844.md) | Jul 29, 2025 | | Linux | mod_security rocky 9 | 0:2.9.6-2.el9_6 | [RLSA-2025:8837](https://patchblox.com/security/data/fix/linux/rlsa-2025-8837.md) | Oct 4, 2025 | | Linux | mod_security-debuginfo amzn 2023 | 2.9.10-1.amzn2023.0.1 | [ALAS2023-2025-1026](https://patchblox.com/security/data/fix/linux/alas2023-2025-1026.md) | Jun 18, 2025 | | Linux | mod_security-debugsource amzn 2023 | 2.9.10-1.amzn2023.0.1 | [ALAS2023-2025-1026](https://patchblox.com/security/data/fix/linux/alas2023-2025-1026.md) | Jun 18, 2025 | | Linux | mod_security-mlogc RHEL 8 | 0:2.9.6-2.el8_10 | [RHSA-2025:8844](https://patchblox.com/security/data/fix/linux/rhsa-2025-8844.md) | Jun 11, 2025 | | Linux | mod_security-mlogc RHEL 9 | 0:2.9.6-2.el9_6 | [RHSA-2025:8837](https://patchblox.com/security/data/fix/linux/rhsa-2025-8837.md) | Jun 11, 2025 | | Linux | mod_security-mlogc almalinux 8 | 2.9.6-2.el8_10 | [ALSA-2025:8844](https://patchblox.com/security/data/fix/linux/alsa-2025-8844.md) | Jun 11, 2025 | | Linux | mod_security-mlogc almalinux 9 | 2.9.6-2.el9_6 | [ALSA-2025:8837](https://patchblox.com/security/data/fix/linux/alsa-2025-8837.md) | Jun 11, 2025 | | Linux | mod_security-mlogc amzn 2023 | 2.9.10-1.amzn2023.0.1 | [ALAS2023-2025-1026](https://patchblox.com/security/data/fix/linux/alas2023-2025-1026.md) | Jun 18, 2025 | | Linux | mod_security-mlogc ol 8 | 0:2.9.6-2.el8_10 | [ELSA-2025-8844](https://patchblox.com/security/data/fix/linux/elsa-2025-8844.md) | Jun 11, 2025 | | Linux | mod_security-mlogc ol 9 | 0:2.9.6-2.el9_6 | [ELSA-2025-8837](https://patchblox.com/security/data/fix/linux/elsa-2025-8837.md) | Jun 11, 2025 | | Linux | mod_security-mlogc-debuginfo amzn 2023 | 2.9.10-1.amzn2023.0.1 | [ALAS2023-2025-1026](https://patchblox.com/security/data/fix/linux/alas2023-2025-1026.md) | Jun 18, 2025 | | Linux | modsecurity-apache Debian 11.6 (bullseye) | 2.9.3-3+deb11u3 | [DLA-4192-1](https://patchblox.com/security/data/fix/linux/dla-4192-1.md) | May 29, 2025 | | Linux | modsecurity-apache Debian 12.15 (bookworm) | 2.9.7-1+deb12u1 | [DSA-5940-1](https://patchblox.com/security/data/fix/linux/dsa-5940-1.md) | Jun 8, 2025 | | Linux | modsecurity-apache Debian 13.5 (trixie) | 2.9.9-1 | [DEBIAN-CVE-2025-47947](https://patchblox.com/security/data/fix/linux/debian-cve-2025-47947.md) | May 21, 2025 | | Linux | modsecurity-apache Debian 14 | 2.9.9-1 | [DEBIAN-CVE-2025-47947](https://patchblox.com/security/data/fix/linux/debian-cve-2025-47947.md) | May 21, 2025 | --- Data as of 2026-11-09T01:18:40Z UTC. 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