CVE-2025-47947

Name: CVE-2025-47947
Creator: NVD / NIST
Published: 2025-05-21T22:15:50.963+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.56%

Last modified Jun 17, 2026

CVE-2025-47947 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.56%

42.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1050

Affected Software

Vendor	Product	Versions
Trustwave	Modsecurity	< 2.9.9

References

https://github.com/owasp-modsecurity/ModSecurity/pull/3389Issue Tracking, Patch
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8rExploit, Vendor Advisory
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8rExploit, Vendor Advisory

Timeline

Published: May 21, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-47947?

How severe is CVE-2025-47947?

CVE-2025-47947 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.

How do I fix CVE-2025-47947?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-47947?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST