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CVE-2025-66017: CGGMP21 presignatures can be used in the way that significantly reduces security

• Severity: high (CVSS 8.2 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-327

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. In versions 0.6.3 and prior of cggmp21 and version 0.7.0-alpha.1 of cggmp24, presignatures can be used in the way that significantly reduces security. cggmp24 version 0.7.0-alpha.2 release contains API changes that make it impossible to use presignatures in contexts in which it reduces security.

Affected products

• LFDT-Lockness cggmp21: cggmp21 <= 0.6.3, cggmp24 = 0.7.0-alpha.1

References

• https://github.com/LFDT-Lockness/cggmp21/security/advisories/GHSA-8frv-q972-9rq5
• https://www.dfns.co/article/cggmp21-vulnerabilities-patched-and-explained

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