Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Trustwave | Modsecurity | < 2.9.9 |
Related Weaknesses (CWE)
References
- https://github.com/owasp-modsecurity/ModSecurity/pull/3389Issue TrackingPatch
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vExploitVendor Advisory
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vExploitVendor Advisory
FAQ
What is CVE-2025-47947?
CVE-2025-47947 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 cas...
How severe is CVE-2025-47947?
CVE-2025-47947 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-47947?
Check the references section above for vendor advisories and patch information. Affected products include: Trustwave Modsecurity.