CVE-2025-29991 — LOW (2.2) — White Hats Nepal

Vulnerability Description

Yubico YubiKey 5.4.1 through 5.7.3 before 5.7.4 has an incorrect FIDO CTAP PIN/UV Auth Protocol Two implementation. It uses the signature length from CTAP PIN/UV Auth Protocol One, even when CTAP PIN/UV Auth Protocol Two was chosen, resulting in a partial signature verification.

CVSS Score

2.2

LOW

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

NONE

Integrity

LOW

Availability

NONE

Related Weaknesses (CWE)

CWE-1390

References

https://www.yubico.com/support/security-advisories/ysa-2025-02/

FAQ

What is CVE-2025-29991?

CVE-2025-29991 is a vulnerability with a CVSS score of 2.2 (LOW). Yubico YubiKey 5.4.1 through 5.7.3 before 5.7.4 has an incorrect FIDO CTAP PIN/UV Auth Protocol Two implementation. It uses the signature length from CTAP PIN/UV Auth Protocol One, even when CTAP PIN/...

How severe is CVE-2025-29991?

CVE-2025-29991 has been rated LOW with a CVSS base score of 2.2/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-29991?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.