How severe is CVE-2020-36843?

CVE-2020-36843 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2020-36843 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2020-36843?

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

Does CVE-2020-36843 have an EU (EUVD) identifier?

Yes. CVE-2020-36843 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6277.

When was CVE-2020-36843 published?

CVE-2020-36843 was published on 2025-03-13 and last updated on 2026-06-17.

CVE-2020-36843

CVE-2020-36843 is a medium-severity vulnerability with a CVSS 3.x base score of 4.3. 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-347.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-6277
Weakness: CWE-347
Published: 2025-03-13
Last modified: 2026-06-17

Description

The implementation of EdDSA in EdDSA-Java (aka ed25519-java) through 0.3.0 exhibits signature malleability and does not satisfy the SUF-CMA (Strong Existential Unforgeability under Chosen Message Attacks) property. This allows attackers to create new valid signatures different from previous signatures for a known message.

Frequently asked questions

What is CVE-2020-36843?: The implementation of EdDSA in EdDSA-Java (aka ed25519-java) through 0.3.0 exhibits signature malleability and does not satisfy the SUF-CMA (Strong Existential Unforgeability under Chosen Message Attacks) property. This allows attackers to create new valid signatures different from previous signatures for a known message.
How severe is CVE-2020-36843?: CVE-2020-36843 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2020-36843 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2020-36843?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2020-36843 have an EU (EUVD) identifier?: Yes. CVE-2020-36843 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6277.
When was CVE-2020-36843 published?: CVE-2020-36843 was published on 2025-03-13 and last updated on 2026-06-17.

References

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