# CVE-2025-66017: RUSTSEC-2025-0127 - CGGMP21 presignatures can be used in the way that significantly reduces security

Source: https://junglewise.ai/threats/cve-2025-66017-cggmp24-and-cggmp21-are-vulnerable-to-signature-forgery-through  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-11-25  
License: CC BY 4.0 with a link back

CVE-2025-66017 · Severity: medium · CVSS 4 · Published 2025-11-25

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.

Technologies: [cggmp21 (crates.io)](https://junglewise.ai/threats/technologies/cggmp21). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is CVE-2025-66017 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-66017 being exploited in the wild.

**How severe is CVE-2025-66017?** Medium severity, with a CVSS score of 4, published 25 November 2025.

**Which products and versions are affected?** cggmp21 (crates.io) SEMVER:introduced=0,last_affected=0.6.3, SEMVER:introduced=0.0.0-0; cggmp24 (crates.io) SEMVER:introduced=0,fixed=0.7.0-alpha.2, SEMVER:introduced=0.0.0-0,fixed=0.7.0-alpha.2.

**Is there a fix for CVE-2025-66017?** Yes. cggmp24 (crates.io): upgrade to 0.7.0-alpha.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-66017?** Check whether you run cggmp21 (crates.io) or cggmp24 (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- cggmp24 (crates.io): upgrade to 0.7.0-alpha.2 or later

  ```sh
  cargo update -p cggmp24
  ```


## Affected products

- cggmp21 (crates.io) SEMVER:introduced=0,last_affected=0.6.3, SEMVER:introduced=0.0.0-0
- cggmp24 (crates.io) SEMVER:introduced=0,fixed=0.7.0-alpha.2, SEMVER:introduced=0.0.0-0,fixed=0.7.0-alpha.2

## Identifiers

- CVE-2025-66017
- GHSA-8frv-q972-9rq5
- RUSTSEC-2025-0127
- RUSTSEC-2025-0128

## Related threats

- [RUSTSEC-2025-0130 - Missing check in ZK proof in CGGMP21 Threshold Signing Protocol](https://junglewise.ai/threats/cve-2025-66016-cggmp21-has-a-missing-check-in-the-zk-proof-used-in-cggmp21)
- [cggmp21 vulnerable to ambiguous challenge derivation](https://junglewise.ai/threats/cggmp21-vulnerable-to-ambiguous-challenge-derivation-76290254)
- [RUSTSEC-2024-0393 - Ambiguous challenge derivation](https://junglewise.ai/threats/rustsec-2024-0393-ambiguous-challenge-derivation-656c2a00)