CVE-2019-11391 — Uncontrolled Resource Consumption in Owasp Modsecurity Core Rule SET

CWE-400 — Uncontrolled Resource ConsumptionCWE-185 — Incorrect Regular Expression6 documents5 sources
Severity
5.3MEDIUMNVD
EPSS
0.4%
top 38.45%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Modsecurity Owasp Modsecurity Core Rule SETDebian Modsecurity-crs
Timeline
PublishedApr 21
Latest updateAug 26

Description

An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0. /rules/REQUEST-933-APPLICATION-ATTACK-PHP.conf allows remote attackers to cause a denial of service (ReDOS) by entering a specially crafted string with $a# at the beginning and nested repetition operators. NOTE: the software maintainer disputes that this is a vulnerability because the issue cannot be exploited via ModSecurity

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LExploitability: 3.9 | Impact: 1.4

Affected Packages2 packages

🔴Vulnerability Details

3
GHSA
GHSA-pvfr-m224-2vm2: An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3↗2022-05-24
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OSV
CVE-2019-11391: An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3↗2019-04-21
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OSV
CVE-2019-11391: ** DISPUTED ** An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3↗2019-04-21
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📋Vendor Advisories

1
Debian
CVE-2019-11391: modsecurity-crs - An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0. ...↗2019
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📄Research Papers

1
arXiv
SoK: A Literature and Engineering Review of Regular Expression Denial of Service (ReDoS)↗2025-08-26
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