What’s Vulnerable › Vulnerabilities
CVE-2025-6011: Timing Side-Channel in Vault’s Userpass Auth Method
- Severity: low (CVSS 3.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-08-01 · updated 2026-06-17
- Weakness: CWE-203
Description
A timing side channel in Vault and Vault Enterprise’s (“Vault”) userpass auth method allowed an attacker to distinguish between existing and non-existing users, and potentially enumerate valid usernames for Vault’s Userpass auth method. Fixed in Vault Community Edition 1.20.1 and Vault Enterprise 1.20.1, 1.19.7, 1.18.12, and 1.16.23.
Affected products
- HashiCorp Vault: before 1.16.23; before 1.20.1; from 1.17.0 before 1.18.12; from 1.19.0 before 1.19.7; 1.20.0 — fixed in 1.16.23, 1.18.12, 1.19.7, 1.20.1
How to fix
Upgrade to a fixed version: HashiCorp Vault 1.16.23, 1.18.12, 1.19.7, 1.20.1. Check the vendor advisory for mitigations.
References
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