CVE-2024-21670

6.5 MEDIUM 0.3% exploit odds Fix listed

What it is

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 A verifier may verify a credential from a holder as being "not revoked" when in fact, the holder's credential has been revoked.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.

At a glance

Exploitability: Can be exploited with physical access with an admin-level account, but needs a user to act. High risk of data exposure, data tampering.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2024-01-16 22:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 07:09 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 6.5 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2024-01-16 22:15 UTC
Last modified: 2026-06-17 07:09 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-327 · Broken cryptographic algorithm
Record status: Modified

Affected

Hyperledger Ursa 0.1.0

Attack profile CVSS 3.1 · 6.5

Attack vector: Physical
Complexity: High
Privileges needed: High
User interaction: Required
Scope: Changed
Confidentiality: High
Integrity: High
Availability: None

Raw vector

CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2024-21670.md and follow it. Check whether this project is affected by CVE-2024-21670. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record