CVE-2025-66016: CGGMP24 is missing a check in the ZK proof used in CGGMP21

Severity: critical (CVSS 9.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-11-25 · updated 2026-10-18
Weakness: CWE-345

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.

Affected products

LFDT-Lockness cggmp21: before 0.6.3

References

https://github.com/LFDT-Lockness/cggmp21/security/advisories/GHSA-m95p-425x-x889
https://www.dfns.co/article/cggmp21-vulnerabilities-patched-and-explained

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