How severe is CVE-2025-29991?

CVE-2025-29991 has a CVSS 3.x base score of 2.2, rated low severity. It is exploitable over local access with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-29991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-29991?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-29991 have an EU (EUVD) identifier?

Yes. CVE-2025-29991 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9570.

When was CVE-2025-29991 published?

CVE-2025-29991 was published on 2025-04-03 and last updated on 2026-06-17.

CVE-2025-29991

CVE-2025-29991 is a low-severity vulnerability with a CVSS 3.x base score of 2.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1390.

Key facts

Severity: Low (CVSS 3.x base score 2.2)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-9570
Weakness: CWE-1390
Published: 2025-04-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-29991?: CVE-2025-29991 has a CVSS 3.x base score of 2.2, rated low severity. It is exploitable over local access with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-29991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-29991?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-29991 have an EU (EUVD) identifier?: Yes. CVE-2025-29991 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9570.
When was CVE-2025-29991 published?: CVE-2025-29991 was published on 2025-04-03 and last updated on 2026-06-17.

References

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

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