CVE-2025-66017 HIGH

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

Vendor Lfdt-Lockness
Product cggmp21
Weakness CWE-327 · Broken crypto
Published November 25, 2025
Last update November 25, 2025
View on NVD All CVEs

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

November 25, 2025 CVE published
November 25, 2025 Record updated