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CVE-2020-36843

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Date: March 12, 2025

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.

Severity Score

Related Resources (7)

https://nvd.nist.gov/vuln/detail/CVE-2020-36843
https://eprint.iacr.org/2020/1244
https://github.com/i2p/i2p.i2p/commit/d7d1dcb5399c61cf2916ccc45aa25b0209c88712#diff-658f7b1aa34b58d27796fccdb8b756c72702d64ae44703374960f1cb89a5a5c3
https://github.com/str4d/ed25519-java/issues/82#issue-727629226
https://github.com/str4d/ed25519-java
https://security-tracker.debian.org/tracker/CVE-2020-36843
https://www.mend.io/vulnerability-database/CVE-2020-36843

Severity Score

Weakness Type (CWE)

Improper Verification of Cryptographic Signature

CWE-347

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

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