# cggmp21 vulnerable to ambiguous challenge derivation

Source: https://junglewise.ai/threats/cggmp21-vulnerable-to-ambiguous-challenge-derivation-76290254  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-11-12  
License: CC BY 4.0 with a link back

Severity: medium · CVSS 4 · Published 2024-11-12

cggmp21 vulnerable to ambiguous challenge derivation

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

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Medium severity, with a CVSS score of 4, published 12 November 2024.

**Which products and versions are affected?** cggmp21 (crates.io) SEMVER:introduced=0,fixed=0.4.0.

**Is there a fix for This vulnerability?** Yes. cggmp21 (crates.io): upgrade to 0.4.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run cggmp21 (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

- cggmp21 (crates.io): upgrade to 0.4.0 or later

  ```sh
  cargo update -p cggmp21
  ```


## Affected products

- cggmp21 (crates.io) SEMVER:introduced=0,fixed=0.4.0

## Related threats

- [RUSTSEC-2025-0127 - CGGMP21 presignatures can be used in the way that significantly reduces security](https://junglewise.ai/threats/cve-2025-66017-cggmp24-and-cggmp21-are-vulnerable-to-signature-forgery-through)
- [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)
- [RUSTSEC-2024-0393 - Ambiguous challenge derivation](https://junglewise.ai/threats/rustsec-2024-0393-ambiguous-challenge-derivation-656c2a00)