CVE-2025-47947: ModSecurity Has Possible DoS Vulnerability
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.
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2025-47947?
CVE-2025-47947 has a severity level classified as high due to its potential for denial of service.
How do I fix CVE-2025-47947?
To fix CVE-2025-47947, you should upgrade ModSecurity to version 2.9.9 or later.
Which versions of ModSecurity are affected by CVE-2025-47947?
CVE-2025-47947 affects all versions of ModSecurity up to and including 2.9.8.
What type of security issue is associated with CVE-2025-47947?
CVE-2025-47947 is associated with a denial of service vulnerability in specific scenarios.
Can CVE-2025-47947 be exploited remotely?
Yes, CVE-2025-47947 can be exploited remotely under certain conditions related to the payload's content type.