Vulnerability · Published Nov 25, 2025 · Assigned by GitHub_M

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

High 8.2

In plain English

A high-severity broken cryptography in cggmp21 from LFDT-Lockness. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 4.0)8.2High

Exploit odds (30 days)0.2%top 86.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
LFDT-Lockness	cggmp21	cggmp21 <= 0.6.3cggmp24 = 0.7.0-alpha.1

Weakness: CWE-327 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

References

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