What is CVE-2019-11387?

CVE-2019-11387 is a medium-severity vulnerability in Modsecurity Owasp Core Rule Set, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2019-04-21.

How severe is CVE-2019-11387?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Modsecurity Owasp Core Rule Set

CVE-2019-11387

An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0. /rules/REQUEST-942-APPLICATION-ATTACK-SQLI.conf allows remote attackers to cause a denial of service (ReDOS) by entering a specially crafted string with nested repetition operators.

Vulnerability class: DoS (Denial of Service)

Published 2019-04-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.024 (83.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

Modsecurity Owasp Core Rule Set

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

github.com/SpiderLabs/owasp-modsecurity-crs/issues/1359 (Third Party Advisory, Issue Tracking)
coreruleset.org/20190627/announcement-owasp-modsecurity-core-rule-set-version-3… (Release Notes, Vendor Advisory)
github.com/SpiderLabs/owasp-modsecurity-crs/blob/v3.1/dev/CHANGES (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2019-11387?: CVE-2019-11387 is a medium-severity vulnerability in Modsecurity Owasp Core Rule Set, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2019-04-21.
How severe is CVE-2019-11387?: Medium severity. CVSS v3 base score is 5.3 out of 10.