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CVE-2025-47947: ModSecurity Has Possible DoS Vulnerability

7.5 CVSS

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.

Classification

CVE ID: CVE-2025-47947

CVSS Base Severity: HIGH

CVSS Base Score: 7.5

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types

CWE-1050: Excessive Platform Resource Consumption within a Loop

Affected Products

Vendor: owasp-modsecurity

Product: ModSecurity

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.08% (probability of being exploited)

EPSS Percentile: 24.25% (scored less or equal to compared to others)

EPSS Date: 2025-06-15 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-47947
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8r
https://github.com/owasp-modsecurity/ModSecurity/pull/3389

Timeline