# CVE-2025-66016

## Summary

- **CVE ID:** CVE-2025-66016
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (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)
- **CWE:** CWE-345
- **Published:** Nov 25, 2025
- **Last Modified:** Mar 13, 2026

## 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 (< 0.6.3)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.19%
- **EPSS Percentile:** 8.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._