What is CVE-2025-52891?

CVE-2025-52891 is a medium-severity vulnerability in Owasp-Modsecurity Modsecurity, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2025-07-02.

How severe is CVE-2025-52891?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Owasp-Modsecurity Modsecurity

CVE-2025-52891

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.004 (29.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Owasp-modsecurity Modsecurity — versions >= 2.9.8, < 2.9.11

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-52891?: CVE-2025-52891 is a medium-severity vulnerability in Owasp-Modsecurity Modsecurity, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2025-07-02.
How severe is CVE-2025-52891?: Medium severity. CVSS v3 base score is 6.5 out of 10.