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Java CVE-2020-36843

MEDIUM
Improper Verification of Cryptographic Signature (CWE-347)
2025-03-13 cve@mitre.org
Java Information Disclosure Jwt Attack Suse
4.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
4.3 MEDIUM
AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
SUSE
MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

3
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 28, 2026 - 18:31 vuln.today
CVE Published
Mar 13, 2025 - 06:15 nvd
MEDIUM 4.3

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 2,439 maven packages depend on net.i2p.crypto:eddsa (237 direct, 2,288 indirect)
  • 5 maven packages depend on net.i2p:i2p (5 direct, 0 indirect)

Ecosystem-wide dependent count for version 0.3.0 and other introduced versions.

DescriptionCVE.org

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.

AnalysisAI

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. Rated medium severity (CVSS 4.3), this vulnerability is no authentication required, low attack complexity.

Technical ContextAI

This vulnerability is classified under CWE-347. 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. Version information: through 0.3.0.

Affected ProductsAI

See vendor advisory for affected versions.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Enterprise Storage 7.1 Fixed
SUSE Linux Enterprise Desktop 15 SP6 SUSE Linux Enterprise High Performance Computing 15 SP6 SUSE Linux Enterprise Module for Development Tools 15 SP6 SUSE Linux Enterprise Server 15 SP6 SUSE Linux Enterprise Server for SAP Applications 15 SP6 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Development Tools 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed

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CVE-2020-36843 vulnerability details – vuln.today
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