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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00029.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Lfdt-lockness
  • Cggmp21

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Lfdt-lockness
  • Cggmp21
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-8frv-q972-9rq5 cggmp24 and cggmp21 are vulnerable to signature forgery through altered presignatures
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/LFDT-Lockness/cggmp21/security/advisories/GHSA-8frv-q972-9rq5 cve-icon cve-icon
https://www.dfns.co/article/cggmp21-vulnerabilities-patched-and-explained cve-icon cve-icon
History

Thu, 27 Nov 2025 10:00:00 +0000

Type Values Removed Values Added
First Time appeared Lfdt-lockness
Lfdt-lockness cggmp21
Vendors & Products Lfdt-lockness
Lfdt-lockness cggmp21

Tue, 25 Nov 2025 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 25 Nov 2025 20:45:00 +0000

Type Values Removed Values Added
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

 cvssV4_0

{'score': 8.2, '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'}

Tue, 25 Nov 2025 20:00:00 +0000

Type Values Removed Values Added
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. 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.
Title CGGMP21 presignatures can be used in the way that significantly reduces security
Weaknesses CWE-327
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-11-25T20:48:35.800Z

Reserved: 2025-11-21T01:08:02.613Z

Link: CVE-2025-66017

cve-icon Vulnrichment

Updated: 2025-11-25T20:47:11.741Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-11-25T20:16:00.850

Modified: 2025-11-25T22:16:16.690

Link: CVE-2025-66017

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-11-27T09:45:47Z