TI-2019-08508 Aliases CVE-2019-11391 GHSA-pvfr-m224-2vm2

An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0.

LOW 33CWE-400Published 2019-04-21 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-400.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01625 76th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:modsecurity:owasp_modsecurity_core_rule_set::::::::	up to 3.1.0	Vulnerable	Modsecurity

cpe:2.3:a:modsecurity:owasp_modsecurity_core_rule_set:*:*:*:*:*:*:*:* Versions up to 3.1.0 Vulnerable ·Modsecurity

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2019-11391
2026-10-03 Alias added: GHSA-pvfr-m224-2vm2

References

Exploit 1

https://github.com/SpiderLabs/owasp-modsecurity-crs/issues/1372

Advisory 1

https://github.com/SpiderLabs/owasp-modsecurity-crs/issues/1357

TI-2019-10109 An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) 3.0.2. CVSS 3.0HIGH 7.5
TI-2019-08504 An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0. CVSS 3.1MEDIUM 5.3
TI-2019-08507 An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0. CVSS 3.1MEDIUM 5.3
TI-2019-08506 An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0. CVSS 3.1MEDIUM 5.3
TI-2019-08505 An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0. CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences