CVE-2020-36843

Name: CVE-2020-36843
Creator: NVD / NIST
Published: 2025-03-13T06:15:34.043+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.13%

Last modified Jun 17, 2026

CVE-2020-36843 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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.. EPSS estimates a 0.13% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

EPSS Probability

0.13%

3.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

References

Timeline

Published: Mar 13, 2025
Last Modified: Jun 17, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2020-36843?

How severe is CVE-2020-36843?

CVE-2020-36843 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.

How do I fix CVE-2020-36843?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-36843?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST