CVE-2025-6011 Timing Side-Channel in Vault’s Userpass Auth Method

What is CVE-2025-6011?

CVE-2025-6011 is a low-severity vulnerability in Hashicorp Vault, published on 1 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-203

Which versions are affected by CVE-2025-6011?

4 open source packages ship an affected version, including github.com/hashicorp/vault and vault. It affects 1 product.

Products include Hashicorp Vault.

How do I fix CVE-2025-6011?

Upgrade github.com/hashicorp/vault to 1.20.1 or later.

Is CVE-2025-6011 being exploited?

There is no known exploitation of CVE-2025-6011 in the wild and no public exploit code.

Other vulnerabilities in Hashicorp Vault

• CVE-2020-35192 Hardcoded credentials in n/a Critical 9.8
• CVE-2020-12757 Improper Input Validation in HashiCorp Vault Critical 9.8
• CVE-2025-6000 Arbitrary Remote Code Execution via Plugin Catalog Abuse Critical 9.1
• CVE-2022-40186 HashiCorp Vault vulnerable to incorrect metadata access Critical 9.1
• CVE-2022-36129 Missing authorization in n/a Critical 9.1

All Hashicorp Vault vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-vault-2025-6011, GHSA-mwgr-84fv-3jh9, GO-2025-3839, MINI-2f83-f3vf-78jj.