Improper Restriction of Excessive Authentication Attempts in OpenBao - CVE-2025-55003
Published: October 28, 2025
Vulnerability identifier: #VU117695
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-55003
CWE-ID: CWE-307
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 brute-force one time passwords.
The vulnerability exists due to an error caused by normalization applied by the underlying TOTP library, which lead to code with a whitespace were accepted. Such a whitespace could bypass internal rate limiting of the MFA method and allow reuse of existing MFA codes.
How to mitigate CVE-2025-55003
Install updates from vendor's website.