# CVE-2024-21670: CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential

Source: https://junglewise.ai/threats/cve-2024-21670-cl-signatures-revocation-scheme-in-ursa-has-flaws-that-allow-a  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-01-16  
License: CC BY 4.0 with a link back

CVE-2024-21670 · Severity: low · CVSS 3.1 · Published 2024-01-16

CL-Signatures Revocation Scheme in Ursa has flaws that allow a holder to demonstrate non-revocation of a revoked credential

Technologies: [anoncreds-clsignatures (crates.io)](https://junglewise.ai/threats/technologies/anoncreds-clsignatures), [ursa (crates.io)](https://junglewise.ai/threats/technologies/ursa). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is CVE-2024-21670 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2024-21670 being exploited in the wild.

**How severe is CVE-2024-21670?** Low severity, with a CVSS score of 3.1, published 16 January 2024.

**Which products and versions are affected?** anoncreds-clsignatures (crates.io) SEMVER:introduced=0; ursa (crates.io) SEMVER:introduced=0,last_affected=0.3.7.

**Is there a fix for CVE-2024-21670?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2024-21670?** Check whether you run anoncreds-clsignatures (crates.io) or ursa (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.

## Affected products

- anoncreds-clsignatures (crates.io) SEMVER:introduced=0
- ursa (crates.io) SEMVER:introduced=0,last_affected=0.3.7

## Identifiers

- CVE-2024-21670
- GHSA-r78f-4q2q-hvv4

## Related threats

- [Ursa CL-Signatures Revocation allows verifiers to generate unique identifiers for holders](https://junglewise.ai/threats/cve-2024-22192-ursa-cl-signatures-revocation-allows-verifiers-to-generate-unique)
- [Breaking unlinkability in Identity Mixer using malicious keys](https://junglewise.ai/threats/cve-2022-31021-breaking-unlinkability-in-identity-mixer-using-malicious-keys)