6.5

CVE-2025-52891: owasp-modsecurity modsecurity Improper Input Validation

CVSS: 6.5v3.1MediumDeferred
AliasesUBUNTU-CVE-2025-52891DEBIAN-CVE-2025-52891openSUSE-SU-2025:15313-1
Published 02-07-2025Last modified 02-07-2025
Open JSON

Vulnerability summary

CVE-2025-52891 is a medium (CVSS 6.5) Improper Input Validation vulnerability in owasp-modsecurity modsecurity. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.6% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.38%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-07-2025
    PublishedVulnerability first disclosed.
  2. 02-07-2025
    Last modifiedVulnerability information updated.

Description

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. In versions 2.9.8 to before 2.9.11, an empty XML tag can cause a segmentation fault. If SecParseXmlIntoArgs is set to On or OnlyArgs, and the request type is application/xml, and at least one XML tag is empty (eg <foo></foo>), then a segmentation fault occurs. This issue has been patched in version 2.9.11. A workaround involves setting SecParseXmlIntoArgs to Off.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

+0.02 pp

From 0.36% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.38%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • modsecurity-apache< 2.9.11-1
Opensuse1 product
  • apache2-mod_security2&distro=openSUSE Tumbleweed< 2.9.11-1.1
Owasp-modsecurity1 product
Ubuntu1 product
  • modsecurityAll versions (No fix recorded)

4 vendors · 4 products

References

6 links