CVE-2025-27110: 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.
Classification
CVE ID: CVE-2025-27110
CVSS Base Severity: HIGH
CVSS Base Score: 7.9
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
Problem Types
CWE-172: Encoding ErrorAffected Products
Vendor: owasp-modsecurity
Product: ModSecurity
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 8.07% (scored less or equal to compared to others)
EPSS Date: 2025-03-26 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-27110https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-42w7-rmv5-4x2j
https://github.com/owasp-modsecurity/ModSecurity/issues/3340