Home/CVE/ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Versions
CVE

CVE-2025-47947

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Versions

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.

HIGH · CVSS 7.5 EPSS 0.00615
Act now
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-1050Excessive Platform Resource Consumption within a Loop
▤

Affected Products & Versions

1
trustwave modsecurity< 2.9.9
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-859r-vvv8-rm8rgithub.com
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD21 May 2025 · 10:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

17
rhsaRHSA-2025:13681Moderate
rhsaRHSA-2025:13680Moderate
suse-csafSUSE-SU-2025:02052-1
suse-csafSUSE-SU-2025:02028-1
suse-csafSUSE-SU-2025:02029-1
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/owasp-modsecurity/ModSecurity/pull/3389Issue TrackingPatch
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