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Servers and applications

CVE-2025-47947

Possible DoS vulnerability

Severity
High 7.5
Published
21 May 2025
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
2.9.9
Also known as
GHSA-859r-vvv8-rm8r
Sources
NVD, Project advisories (GitHub)

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…

Affected software

SoftwareAffected versions
ModSecurityServers and applications · cpe:a:trustwave:modsecurity
  • Every version before 2.9.9
ModSecurityServers and applications · github:owasp-modsecurity/modsecurity
  • Version 2.9.8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-47947
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-47947
  • GitHub Advisory Database https://github.com/advisories/GHSA-859r-vvv8-rm8r
  • github.com https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8r