CVSS 3.1 Score 6.5 of 10 (medium)


Published Jan 16, 2024
Updated: Jan 24, 2024
CWE ID 327


CVE-2024-21670 is a vulnerability affecting the Ursa cryptographic library used with blockchains. The flaw lies in the revocation schema of the Ursa CL-Signatures implementation, potentially compromising the privacy guarantees of the AnonCreds verifiable credential model. A malicious holder of a revoked credential could generate a valid Non-Revocation Proof, leading a verifier to incorrectly perceive the credential as "not revoked." Unfortunately, Ursa has reached end-of-life status, and no fix is expected. The vulnerability has a base severity rating of MEDIUM, requiring high privileges and user interaction, with a physical attack vector and high impact on integrity and confidentiality.

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