CGGMP21 presignatures can be used in the way that significantly reduces security
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-327.
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. 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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
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 | cggmp21 <= 0.6.3; cggmp24 = 0.7.0-alpha.1 | — | No fix listed | CNA |
| — | cggmp21 (crates.io) | up to 0.6.3 | — | No fix listed | GHSA-8frv-q972-9rq5 |
| — | cggmp24 (crates.io) | before 0.7.0-alpha.2 | 0.7.0-alpha.2 | Patch available | GHSA-8frv-q972-9rq5 |
- cggmp21 VendorLFDT-Lockness Affected cggmp21 <= 0.6.3; cggmp24 = 0.7.0-alpha.1 Fixed in — No fix listed CNA
- cggmp21 (crates.io) Vendor— Affected up to 0.6.3 Fixed in — No fix listed GHSA-8frv-q972-9rq5
- cggmp24 (crates.io) Vendor— Affected before 0.7.0-alpha.2 Fixed in 0.7.0-alpha.2 Patch available GHSA-8frv-q972-9rq5
Remediation
- Fix · GHSA-8frv-q972-9rq5 cggmp24 (crates.io) Fixed in 0.7.0-alpha.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-66017
- 2026-10-03 Alias added: GHSA-8frv-q972-9rq5
References
Other 6
- https://github.com/LFDT-Lockness/cggmp21/security/advisories/GHSA-8frv-q972-9rq5
- https://www.dfns.co/article/cggmp21-vulnerabilities-patched-and-explained
- https://github.com/LFDT-Lockness/cggmp21/commit/9d98157e151596573cb071da59d27a4e0ac9b8dc
- https://github.com/LFDT-Lockness/cggmp21
- https://rustsec.org/advisories/RUSTSEC-2025-0127.html
- https://rustsec.org/advisories/RUSTSEC-2025-0128.html
More LFDT-Lockness vulnerabilities
- TI-2025-40543 CGGMP24 is missing a check in the ZK proof used in CGGMP21 CVSS 4.0CRITICAL 9.3
Sources
- CVE-2025-66017 · CVE Program
- CVE-2025-66017 · NVD
- FIRST EPSS
- GHSA-8frv-q972-9rq5 · GitHub Advisory Database · CC BY 4.0
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