CVE-2025-47947

Public Exploit
ModSecurity Has Possible DoS 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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.04%
Vendor Advisory github.com
Affected: owasp-modsecurity ModSecurity
Published at:
Updated at:

References

Link Tags
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8r vendor advisory exploit
https://github.com/owasp-modsecurity/ModSecurity/pull/3389 issue tracking patch

Frequently Asked Questions

What is the severity of CVE-2025-47947?
CVE-2025-47947 has been scored as a high severity vulnerability.
How to fix CVE-2025-47947?
To fix CVE-2025-47947, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-47947 being actively exploited in the wild?
It is possible that CVE-2025-47947 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-47947?
CVE-2025-47947 affects owasp-modsecurity ModSecurity.
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