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Fencer Intel
high 7.5

CVE-2025-27110 json

Libmodsecurity3 has possible bypass of encoded HTML entities

published last yr. modified 2mo ago also BIT-modsecurity-2025-27110 , BIT-modsecurity2-2025-27110 , EUVD-2025-5324 , GHSA-42w7-rmv5-4x2j

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami modsecurity 3.0.14
  • owasp libmodsecurity 3.0.14
  • owasp modsecurity 3.0.14
  • owasp owasp_modsecurity 3.0.14
  • trustwave modsecurity 3.0.14
  • modsecurity Debian 14, Debian 13 3.0.14-1

debian advisories DEBIAN-CVE-2025-27110

  • modsecurity openSUSE Tumbleweed 3.0.14-1.1

opensuse advisories openSUSE-SU-2025:14946-1

Is CVE-2025-27110 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-27110 updated cvss 8.6

mod_security: Libmodsecurity3 has possible bypass of encoded HTML entities

  • Red Hat Enterprise Linux 7 mod_security_crs Red Hat Enterprise Linux 8 mod_security, mod_security_crs, mod_security-mlogc Red Hat Enterprise Linux 9 mod_security, mod_security_crs, mod_security-mlogc Red Hat JBoss Core Services jbcs-httpd24-mod_security, jbcs-httpd24-mod_security-src-zip
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/owasp-modsecurity/ModSecurity/issues/3340 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 7.9 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
CNA 4.0 7.9 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
bitnami modsecurity
>=3.0.13, <3.0.14
3.0.14
bitnami modsecurity2
>=3.0.13
 no fix listed

Affected products

  • owasp-modsecurity ModSecurity

Classification

Weakness
  • CWE-172 Improper Encoding or Decoding of Data

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.