CVE-2025-6011: Hashicorp Vault has an Observable Discrepancy on Existing and Non-Existing Users

August 1, 2025

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.

References

discuss.hashicorp.com/t/hcsec-2025-15-timing-side-channel-in-vault-s-userpass-auth-method/76034
github.com/advisories/GHSA-mwgr-84fv-3jh9
github.com/hashicorp/vault
nvd.nist.gov/vuln/detail/CVE-2025-6011

Code Behaviors & Features

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