CVE-2025-47947
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductTrustwave Modsecurity
PublishedMay 21, 2025
First seenMay 21, 2025
Weakness typeCWE-1050CWE-1050
How to fix
Update
- trustwave modsecurity2.9.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| trustwave modsecurity | v < 2.9.9 | 2.9.9 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.