VULNERABILITY INTELLIGENCE

CVE-2024-21670

CVSS score6.5 MEDIUM
EPSS probability0.28%
CISA KEVNot currently listed
Published2024-01-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N

Description

Ursa is a cryptographic library for use with blockchains. The revocation schema that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, allowing a malicious holder of a revoked credential to generate a valid Non-Revocation Proof for that credential as part of an AnonCreds presentation. A verifier may verify a credential from a holder as being "not revoked" when in fact, the holder's credential has been revoked. Ursa has moved to end-of-life status and no fix is expected.

Weakness classification

  • CWE-327: Use of a Broken or Risky Cryptographic Algorithm

Primary references