Observable discrepancy in OpenBao - CVE-2025-54999
Published: October 28, 2025
Vulnerability identifier: #VU117698
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-54999
CWE-ID: CWE-203
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenBao
Affected software:
OpenBao
OpenBao
Detailed vulnerability description
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to timing difference between non-existent users and users with stored credentials when userpass auth method is used. A remote attacker can enumerate existing application users.
How to mitigate CVE-2025-54999
Install updates from vendor's website.
Sources
- https://discuss.hashicorp.com/t/hcsec-2025-15-timing-side-channel-in-vault-s-userpass-auth-method/76034
- https://discuss.hashicorp.com/t/hcsec-2025-21-vault-user-enumeration-in-userpass-auth-method/76095
- https://github.com/openbao/openbao/commit/4d9b5d3d6486ab9fbd5b644173fa0097015d6626
- https://github.com/openbao/openbao/security/advisories/GHSA-hh28-h22f-8357