What is CVE-2020-36843?

CVE-2020-36843 is a medium-severity vulnerability in Str4d Ed25519-java, classified under Improper Verification of Cryptographic Signature. CVSS score: 4.3/10. Published 2025-03-13.

How severe is CVE-2020-36843?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Is CVE-2020-36843 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Str4d Ed25519-java

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…

EPSS: 0.001 (3.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.

Affected products

Str4d Ed25519-java — versions 0

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

Public proof-of-concept exploits

averemee-si/oracdc

References

Frequently asked questions

What is CVE-2020-36843?: CVE-2020-36843 is a medium-severity vulnerability in Str4d Ed25519-java, classified under Improper Verification of Cryptographic Signature. CVSS score: 4.3/10. Published 2025-03-13.
How severe is CVE-2020-36843?: Medium severity. CVSS v3 base score is 4.3 out of 10.
Is CVE-2020-36843 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.