What is CVE-2025-29991?

CVE-2025-29991 is a low-severity vulnerability in Yubico Yubikey, classified under Weak Authentication. CVSS score: 2.2/10. Published 2025-04-03.

How severe is CVE-2025-29991?

Low severity. CVSS v3 base score is 2.2 out of 10.

Vulnerability in Yubico Yubikey

CVE-2025-29991

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.

EPSS: 0.001 (1.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 2.2 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N.

Affected products

Yubico Yubikey — versions 5.4.1

Weakness classification (CWE)

CWE-1390 — Weak Authentication

References

cve@mitre.org

Frequently asked questions

What is CVE-2025-29991?: CVE-2025-29991 is a low-severity vulnerability in Yubico Yubikey, classified under Weak Authentication. CVSS score: 2.2/10. Published 2025-04-03.
How severe is CVE-2025-29991?: Low severity. CVSS v3 base score is 2.2 out of 10.