CVE-2025-27110
Libmodsecurity3 has possible bypass of encoded HTML entities
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Libmodsecurity3 has possible bypass of encoded HTML entities
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.
- Record
CVE-2025-27110- CVSS 4.0
- 7.9 High
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 - Weakness
- CWE-172
- Updated
- 2026-11-02
EUVDEUVD-2025-5324
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.
- Record
EUVD-2025-5324- CVSS 4.0
- 7.9 High
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 - Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-27110- CVSS 4.0
- 7.9 High
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 - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-172
- Updated
- 2026-11-02
OSV
Libmodsecurity3 has possible bypass of encoded HTML entities
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.
- Record
CVE-2025-27110- CVSS 4.0
- 7.9 High
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 - Weakness
- CWE-172
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2025-27110
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.
- Record
DEBIAN-CVE-2025-27110- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVUBUNTU-CVE-2025-27110
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.
- Record
UBUNTU-CVE-2025-27110- CVSS 4.0
- 7.9 High
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 - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVBIT-modsecurity-2025-27110 No score
Libmodsecurity3 has possible bypass of encoded HTML entities
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.
- Record
BIT-modsecurity-2025-27110- Updated
- 2026-11-02
OSVBIT-modsecurity2-2025-27110 No score
Libmodsecurity3 has possible bypass of encoded HTML entities
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.
- Record
BIT-modsecurity2-2025-27110- Updated
- 2026-11-02
OSVopenSUSE-SU-2025:14946-1 No score
libmodsecurity3-3.0.14-1.1 on GA media
These are all security issues fixed in the libmodsecurity3-3.0.14-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2025:14946-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
modsecurityBitnami |
3.0.13 up to 3.0.14 | 3.0.14 |
modsecurity2Bitnami |
3.0.13 and later | None known |
modsecurityDebian:13 |
before 3.0.14-1 | 3.0.14-1 |
modsecurityDebian:14 |
before 3.0.14-1 | 3.0.14-1 |
modsecurityUbuntu:20.04:LTS |
All versions, plus listed versions 3.0.3-13.0.4-13.0.4-1build1 |
None known |
modsecurityUbuntu:22.04:LTS |
All versions, plus listed versions 3.0.4-23.0.6-1 |
None known |
modsecurityUbuntu:24.04:LTS |
All versions, plus listed versions 3.0.10-13.0.11-13.0.12-13.0.12-1.1build13.0.12-1.1build2 |
None known |
modsecurityUbuntu:25.10 |
All versions, plus listed versions 3.0.13-13.0.14-13.0.14-1build1 |
None known |
modsecurityUbuntu:26.10 |
All versions, plus listed versions 3.0.14-1build23.0.15-13.0.16-1 |
None known |
modsecurityUbuntu:26.04:LTS |
All versions, plus listed versions 3.0.14-1build13.0.14-1build2 |
None known |
modsecurityopenSUSE:Tumbleweed |
before 3.0.14-1.1 | 3.0.14-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-27110 is a high vulnerability (CVSS 7.9) in Owasp-modsecurity Modsecurity, published February 25, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 42nd percentile. Fixed in modsecurity 3.0.14.
References
github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-42w7-rmv5-4x2j
nvd.nist.gov/vuln/detail/CVE-2025-27110
security-tracker.debian.org/tracker/CVE-2025-27110
ubuntu.com/security/CVE-2025-27110
cve.org/CVERecord?id=CVE-2025-27110
lists.opensuse.org/archives/list/[email protected]/thread/GA6CQ6PAGPDDZZQONRAGSFIF4ZQCF3FK
suse.com/security/cve/CVE-2025-27110