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

Published Aug 1, 2025
·
Updated

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 Software

8 affected componentsFixes available
HashiCorp Vault<1.20.1
HashiCorp Vault Enterprise>=1.19.7<=1.20.1, >=1.18.12<=1.19.7, >=1.16.23<=1.18.12
go/github.com/hashicorp/vault<1.20.1
1.20.1
HashiCorp Vault<1.16.23
HashiCorp Vault<1.20.1
HashiCorp Vault>=1.17.0<1.18.12
HashiCorp Vault>=1.19.0<1.19.7
HashiCorp Vault=1.20.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade go/github.com/hashicorp/vault to a version that resolves this vulnerability.

    Fixed in 1.20.1
  2. Upgrade

    Upgrade Vault Community Edition to a version that resolves this vulnerability.

    Fixed in 1.20.1
  3. Upgrade

    Upgrade Vault Enterprise to a version that resolves this vulnerability.

    Fixed in 1.20.1
  4. Upgrade

    Upgrade Vault Enterprise to a version that resolves this vulnerability.

    Fixed in 1.19.7
  5. Upgrade

    Upgrade Vault Enterprise to a version that resolves this vulnerability.

    Fixed in 1.18.12
  6. Upgrade

    Upgrade Vault Enterprise to a version that resolves this vulnerability.

    Fixed in 1.16.23

Event History

Aug 1, 2025
CVE Published
via MITRE·06:00 PM
Data Sourced
via MITRE·06:00 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·06:15 PM
DescriptionSeverityWeaknessAffected Software
Advisory Published
via GitHub·06:31 PM
Data Sourced
via GitHub·06:31 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2025-6011?

CVE-2025-6011 is considered a moderate severity vulnerability due to its potential for user enumeration.

2

How do I fix CVE-2025-6011?

To mitigate CVE-2025-6011, upgrade to Vault Community Edition 1.20.1 or later, or to a patched version of Vault Enterprise.

3

What impact does CVE-2025-6011 have on user authentication?

CVE-2025-6011 allows attackers to potentially enumerate valid usernames through timing side channels in the userpass auth method.

4

Which versions of Vault are affected by CVE-2025-6011?

CVE-2025-6011 affects Vault versions prior to 1.20.1 and certain versions of Vault Enterprise between 1.20.1 and 1.16.23.

5

Is CVE-2025-6011 exploitable remotely?

Yes, CVE-2025-6011 can be exploited remotely by an attacker to expose valid usernames.

Company

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