Vulnerability details

CVE-2025-66016

LFDT-Lockness cggmp21

CGGMP24 is missing a check in the ZK proof used in CGGMP21

CVSS 4.0

9.3Critical

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. 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.

CVSS scores

Score	Version	Source	Vector
9.3Critical	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`

Affected products

Vendor	Product	Versions	Source
LFDT-Lockness	cggmp21	< 0.6.3	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2025-11-25
Last updated: 2025-11-26
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.19%

Probability of exploitation in 30 days

9.8%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-345
Insufficient Verification of Data Authenticity