CVE-2025-27110

Public Exploit
Libmodsecurity3 has possible bypass of encoded HTML entities

Description

Libmodsecurity is one component of the ModSecurity v3 project. The library codebase serves as an interface to ModSecurity Connectors taking in web traffic and applying traditional ModSecurity processing. A bug that exists only in Libmodsecurity3 version 3.0.13 means that, in 3.0.13, Libmodsecurity3 can't decode encoded HTML entities if they contains leading zeroes. Version 3.0.14 contains a fix. No known workarounds are available.

Category

7.9
CVSS
Severity: High
CVSS 4.0 •
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-42w7-rmv5-4x2j vendor advisory
https://github.com/owasp-modsecurity/ModSecurity/issues/3340 issue tracking exploit

Frequently Asked Questions

What is the severity of CVE-2025-27110?
CVE-2025-27110 has been scored as a high severity vulnerability.
How to fix CVE-2025-27110?
To fix CVE-2025-27110, 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-2025-27110 being actively exploited in the wild?
It is possible that CVE-2025-27110 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-2025-27110?
CVE-2025-27110 affects owasp-modsecurity ModSecurity.
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