How severe is CVE-2025-66016?

CVE-2025-66016 has a CVSS 4.0 base score of 9.3, rated critical severity.

Is CVE-2025-66016 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66016?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-66016 have an EU (EUVD) identifier?

Yes. CVE-2025-66016 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199643.

When was CVE-2025-66016 published?

CVE-2025-66016 was published on 2025-11-25 and last updated on 2026-06-17.

CVE-2025-66016

CVE-2025-66016 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. 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-345.

Key facts

Severity: Critical (CVSS 4.0 base score 9.3)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199643
Weakness: CWE-345
Published: 2025-11-25
Last modified: 2026-06-17

Description

CGGMP24 is a state-of-art ECDSA TSS protocol that supports 1-round signing (requires 3 preprocessing rounds), identifiable abort, and a key refresh protocol. Prior to version 0.6.3, there is a missing check in the ZK proof that enables an attack in which single malicious signer can reconstruct full private key. This issue has been patched in version 0.6.3, for full mitigation it is recommended to upgrade to cggmp24 version 0.7.0-alpha.2 as it contains more security checks.

Frequently asked questions

What is CVE-2025-66016?: CGGMP24 is a state-of-art ECDSA TSS protocol that supports 1-round signing (requires 3 preprocessing rounds), identifiable abort, and a key refresh protocol. Prior to version 0.6.3, there is a missing check in the ZK proof that enables an attack in which single malicious signer can reconstruct full private key. This issue has been patched in version 0.6.3, for full mitigation it is recommended to upgrade to cggmp24 version 0.7.0-alpha.2 as it contains more security checks.
How severe is CVE-2025-66016?: CVE-2025-66016 has a CVSS 4.0 base score of 9.3, rated critical severity.
Is CVE-2025-66016 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-66016?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-66016 have an EU (EUVD) identifier?: Yes. CVE-2025-66016 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199643.
When was CVE-2025-66016 published?: CVE-2025-66016 was published on 2025-11-25 and last updated on 2026-06-17.

References

Other CWE-345 (Insufficient Verification of Data Authenticity) vulnerabilities

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