GHSA-6c5r-4wfc-3mcx — medium GitHub Advisory (CVE-2025-6037) in go/github.com/hashicorp/vault

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.

Basic information

Type: reviewed
Severity: medium
Advisory on GitHub: Open advisory ↗
Repository advisory: —
Source code: Browse source ↗
Published (advisory): 2025-08-01 18:31:19 UTC
Updated: 2025-08-01 21:09:19 UTC
GitHub reviewed: 2025-08-01 21:09:19 UTC
NVD published: 2025-08-01

Score	Percentile
0.06%	18.69%

CVSS Scores

Base score	Version	Severity	Vector
6.8	3.1	—	`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:H) They need powerful rights—admin, root, or similar—before this pays off. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type	Value
GHSA	GHSA-6c5r-4wfc-3mcx ↗
CVE	CVE-2025-6037 ↗

CWEs

CWE id	Name
CWE-295	Improper Certificate Validation

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
go	github.com/hashicorp/vault	< 1.20.1	1.20.1	—

Hashicorp Vault has Incorrect Validation for Non-CA Certificates