How severe is CVE-2024-21670?

CVE-2024-21670 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over physical access with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2024-21670 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21670?

CVE-2024-21670 affects Hyperledger Ursa. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-21670?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-21670 have an EU (EUVD) identifier?

Yes. CVE-2024-21670 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0413.

When was CVE-2024-21670 published?

CVE-2024-21670 was published on 2024-01-16 and last updated on 2026-06-17.

CVE-2024-21670

CVE-2024-21670 is a medium-severity vulnerability in Hyperledger Ursa with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-0413
Weakness: CWE-327
Affected product: Hyperledger Ursa
Published: 2024-01-16
Last modified: 2026-06-17

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 A verifier may verify a credential from a holder as being "not revoked" when in fact, the holder's credential has been revoked.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

Frequently asked questions

What is CVE-2024-21670?: 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.
How severe is CVE-2024-21670?: CVE-2024-21670 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over physical access with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2024-21670 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21670?: CVE-2024-21670 affects Hyperledger Ursa. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-21670?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-21670 have an EU (EUVD) identifier?: Yes. CVE-2024-21670 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0413.
When was CVE-2024-21670 published?: CVE-2024-21670 was published on 2024-01-16 and last updated on 2026-06-17.

References

https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-r78f-4q2q-hvv4

Affected products (1)

cpe:2.3:a:hyperledger:ursa:0.1.0:*:*:*:*:rust:*:*

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CVE-2024-22192 — Medium (CVSS 6.5): Ursa is a cryptographic library for use with blockchains. The revocation scheme that is part of the Ursa CL-Signatures…
CVE-2022-31021 — Low (CVSS 3.3): Ursa is a cryptographic library for use with blockchains. A weakness in the Hyperledger AnonCreds specification that is…

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