CGGMP24 is missing a check in the ZK proof used in CGGMP21
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-345.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| LFDT-Lockness | cggmp21 | before 0.6.3 | 0.6.3 | Patch available | CNA |
| — | cggmp21 (crates.io) | before 0.6.3 | 0.6.3 | Patch available | GHSA-m95p-425x-x889 |
| — | cggmp24 (crates.io) | before 0.7.0-alpha.2 | 0.7.0-alpha.2 | Patch available | GHSA-m95p-425x-x889 |
- cggmp21 VendorLFDT-Lockness Affected before 0.6.3 Fixed in 0.6.3 Patch available CNA
- cggmp21 (crates.io) Vendor— Affected before 0.6.3 Fixed in 0.6.3 Patch available GHSA-m95p-425x-x889
- cggmp24 (crates.io) Vendor— Affected before 0.7.0-alpha.2 Fixed in 0.7.0-alpha.2 Patch available GHSA-m95p-425x-x889
Remediation
- Fix · CNA cggmp21 (LFDT-Lockness) Fixed in 0.6.3
- Fix · GHSA-m95p-425x-x889 cggmp21 (crates.io) Fixed in 0.6.3 Advisory →
- Fix · GHSA-m95p-425x-x889 cggmp24 (crates.io) Fixed in 0.7.0-alpha.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-66016
- 2026-10-03 Alias added: GHSA-m95p-425x-x889
References
Other 6
- https://github.com/LFDT-Lockness/cggmp21/security/advisories/GHSA-m95p-425x-x889
- https://www.dfns.co/article/cggmp21-vulnerabilities-patched-and-explained
- https://github.com/LFDT-Lockness/cggmp21/commit/60e0ada5291e771d5649793329d99edd32285e72
- https://github.com/LFDT-Lockness/cggmp21
- https://rustsec.org/advisories/RUSTSEC-2025-0129.html
- https://rustsec.org/advisories/RUSTSEC-2025-0130.html
More LFDT-Lockness vulnerabilities
- TI-2025-40544 CGGMP21 presignatures can be used in the way that significantly reduces security CVSS 4.0HIGH 8.2
Sources
- CVE-2025-66016 · CVE Program
- CVE-2025-66016 · NVD
- FIRST EPSS
- GHSA-m95p-425x-x889 · GitHub Advisory Database · CC BY 4.0
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