CVE-2025-29991
low-risk
Published 2025-04-03
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.
Do I need to act?
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0.05% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
2
CVSS 2.2/10
Low
LOCAL
/ HIGH complexity
11
/ 100
low-risk
Severity
6/34 · Minimal
Exploitability
0/34 · Minimal
Exposure
5/34 · Minimal