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Fencer Vulns
high 7.5

CVE-2025-47947 json

ModSecurity Has Possible DoS Vulnerability

published 2025-05-21 17 mo ago modified 2026-09-08 2 mo ago also BIT-modsecurity-2025-47947 , BIT-modsecurity2-2025-47947 , EUVD-2025-16086 , GHSA-859r-vvv8-rm8r

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami modsecurity 3.0.12
  • bitnami modsecurity2 2.9.9
  • modsecurity-apache Debian 12 2.9.7-1+deb12u1
  • modsecurity-apache Debian 14, Debian 13 2.9.9-1

debian advisories DEBIAN-CVE-2025-47947

  • modsecurity-apache Ubuntu Pro 14.04 LTS 2.7.7-2ubuntu0.1~esm2
  • modsecurity-apache Ubuntu Pro 16.04 LTS 2.9.0-1ubuntu0.1~esm2
  • modsecurity-apache Ubuntu Pro 18.04 LTS 2.9.2-1ubuntu0.1~esm2
  • modsecurity-apache Ubuntu Pro 20.04 LTS 2.9.3-1ubuntu0.1+esm1
  • modsecurity-apache Ubuntu Pro 22.04 LTS 2.9.5-1ubuntu0.1~esm2
  • modsecurity-apache Ubuntu Pro 24.04 LTS 2.9.7-1ubuntu0.24.04.1~esm1

ubuntu advisories UBUNTU-CVE-2025-47947

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • jbcs-httpd24-httpd jboss core services 1 2.4.62-8.el7jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.62-8.el8jbcs
  • jbcs-httpd24-mod_jk jboss core services 1 1.2.50-9.redhat_1.el7jbcs
  • jbcs-httpd24-mod_jk jboss core services 1 1.2.50-9.redhat_1.el8jbcs
  • jbcs-httpd24-mod_md jboss core services 1 1:2.4.28-10.el7jbcs
  • jbcs-httpd24-mod_md jboss core services 1 1:2.4.28-10.el8jbcs
  • jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.62-8.el7jbcs
  • jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.62-8.el8jbcs

red hat advisories RHSA-2025:13680RHSA-2025:8937RHSA-2025:8922RHSA-2025:8917RHSA-2025:8844RHSA-2025:8837

  • apache2-mod_security2 SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 2.9.2-150000.3.12.1
  • apache2-mod_security2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +10 more 2.9.4-150400.3.9.1
  • apache2-mod_security2 SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.8.0-7.9.1

suse advisories SUSE-SU-2025:02052-1SUSE-SU-2025:02029-1SUSE-SU-2025:02028-1

  • apache2-mod_security2 openSUSE Tumbleweed 2.9.10-1.1

opensuse advisories openSUSE-SU-2025:15197-1

  • mod_security AlmaLinux 9 2.9.6-2.el9_6
  • mod_security-mlogc AlmaLinux 9 2.9.6-2.el9_6
  • mod_security AlmaLinux 8 2.9.6-2.el8_10
  • mod_security-mlogc AlmaLinux 8 2.9.6-2.el8_10

almalinux advisories ALSA-2025:8837ALSA-2025:8844

  • mod_security Rocky Linux 9 2.9.6-2.el9_6
  • mod_security Rocky Linux 8 2.9.6-2.el8_10

rocky linux advisories RLSA-2025:8837RLSA-2025:8844

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-47947 updated cvss 7.5

modsecurity: ModSecurity Has Possible DoS Vulnerability

  • Red Hat Enterprise Linux AppStream (v. 8) mod_security 2.9.6-2.el8_10, mod_security-mlogc 2.9.6-2.el8_10
    fixed: vendor fix RHSA-2025:8844
  • Red Hat Enterprise Linux AppStream (v. 9) mod_security 2.9.6-2.el9_6, mod_security-mlogc 2.9.6-2.el9_6
    fixed: vendor fix RHSA-2025:8837
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) mod_security 2.9.2-8.el8_2.1, mod_security-mlogc 2.9.2-8.el8_2.1
    fixed: vendor fix RHSA-2025:8626
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) mod_security 2.9.2-9.el8_4.1, mod_security-mlogc 2.9.2-9.el8_4.1
    fixed: vendor fix RHSA-2025:8627
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) mod_security 2.9.2-9.el8_6.1, mod_security-mlogc 2.9.2-9.el8_6.1 Red Hat Enterprise Linux AppStream E4S (v.8.6) mod_security 2.9.2-9.el8_6.1, mod_security-mlogc 2.9.2-9.el8_6.1
    fixed: vendor fix RHSA-2025:8605
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) mod_security 2.9.6-1.el8_8.1, mod_security-mlogc 2.9.6-1.el8_8.1
    fixed: vendor fix RHSA-2025:8674
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) mod_security 2.9.3-12.el9_0.1, mod_security-mlogc 2.9.3-12.el9_0.1
    fixed: vendor fix RHSA-2025:8922
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) mod_security 2.9.6-1.el9_2.1, mod_security-mlogc 2.9.6-1.el9_2.1
    fixed: vendor fix RHSA-2025:8937
show 6 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) mod_security 2.9.6-1.el9_4.1, mod_security-mlogc 2.9.6-1.el9_4.1
    fixed: vendor fix RHSA-2025:8917
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) mod_security 2.9.2-9.el8_6.1, mod_security-mlogc 2.9.2-9.el8_6.1
    fixed: vendor fix RHSA-2025:8605
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) mod_security 2.9.6-1.el8_8.1, mod_security-mlogc 2.9.6-1.el8_8.1
    fixed: vendor fix RHSA-2025:8674
  • Red Hat JBoss Core Services 2.4.62.SP1
    fixed: vendor fix RHSA-2025:13681
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.62-8.el7jbcs, jbcs-httpd24-mod_md 2.4.28-10.el7jbcs, jbcs-httpd24-mod_ssl 2.4.62-8.el7jbcs, jbcs-httpd24-mod_ldap 2.4.62-8.el7jbcs, jbcs-httpd24-mod_http2 2.0.29-5.el7jbcs, jbcs-httpd24-httpd-tools 2.4.62-8.el7jbcs, +8 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd 2.4.62-8.el8jbcs, jbcs-httpd24-mod_md 2.4.28-10.el8jbcs, jbcs-httpd24-mod_ssl 2.4.62-8.el8jbcs, jbcs-httpd24-mod_ldap 2.4.62-8.el8jbcs, jbcs-httpd24-mod_http2 2.0.29-5.el8jbcs, jbcs-httpd24-httpd-tools 2.4.62-8.el8jbcs, +8 more
    fixed: vendor fix RHSA-2025:13680
  • Red Hat Enterprise Linux 7 mod_security_crs Red Hat Enterprise Linux 8 mod_security_crs Red Hat Enterprise Linux 9 mod_security_crs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
17 mo ago

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8r referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami modsecurity
<3.0.12
3.0.12
bitnami modsecurity2
<2.9.9
2.9.9

Affected products

  • owasp-modsecurity ModSecurity

Classification

Weakness
  • CWE-1050 Excessive Platform Resource Consumption within a Loop

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.