FKIE_CVE-2020-36843

Vulnerability from fkie_nvd - Published: 2025-03-13 06:15 - Updated: 2026-06-17 03:16
Severity
4.3 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Summary
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.
References
cve@mitre.orghttps://eprint.iacr.org/2020/1244
cve@mitre.orghttps://github.com/str4d/ed25519-java/issues/82#issue-727629226
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "product": "ed25519-java",
          "vendor": "str4d",
          "versions": [
            {
              "lessThanOrEqual": "0.3.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "La implementaci\u00f3n de EdDSA en EdDSA-Java (tambi\u00e9n conocido como ed25519-java) hasta la versi\u00f3n 0.3.0 presenta maleabilidad de firmas y no cumple con la propiedad SUF-CMA (Fuerte Infalsificaci\u00f3n Existencial ante Ataques de Mensajes Elegidos). Esto permite a los atacantes crear nuevas firmas v\u00e1lidas, diferentes de las firmas previas, para un mensaje conocido."
    }
  ],
  "id": "CVE-2020-36843",
  "lastModified": "2026-06-17T03:16:18.577",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 1.4,
        "source": "cve@mitre.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2020-36843",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-03-18T16:22:00.551300Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-03-13T06:15:34.043",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "https://eprint.iacr.org/2020/1244"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/str4d/ed25519-java/issues/82#issue-727629226"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Secondary"
    }
  ]
}



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