Vulnerability-Lookup

OESA-2025-1334 (CVE-2020-36843)

Vulnerability from osv_openeuler – Published: 2025-03-29 11:08 – Updated: 2026-08-06 11:08 – Source website

Summary

ed25519-java security update

Details

This is an implementation of EdDSA in Java. Structurally, it is based on the ref10 implementation in SUPERCOP (see http://ed25519.cr.yp.to/software.html). There are two internal implementations: * A port of the radix-2^51 operations in ref10 - fast and constant-time, but only useful for Ed25519. * A generic version using BigIntegers for calculation - a bit slower and not constant-time, but compatible with any EdDSA parameter specification.

Security Fix(es):

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.(CVE-2020-36843)

Severity

4.3 (Medium)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-36843	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "noarch": [
          "ed25519-java-0.3.0-5.oe2203sp3.noarch.rpm",
          "ed25519-java-javadoc-0.3.0-5.oe2203sp3.noarch.rpm"
        ],
        "src": [
          "ed25519-java-0.3.0-5.oe2203sp3.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP3",
        "name": "ed25519-java",
        "purl": "pkg:rpm/openEuler/ed25519-java\u0026distro=openEuler-22.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.0-5.oe2203sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "noarch": [
          "ed25519-java-0.3.0-5.oe2203sp4.noarch.rpm",
          "ed25519-java-javadoc-0.3.0-5.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "ed25519-java-0.3.0-5.oe2203sp4.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "ed25519-java",
        "purl": "pkg:rpm/openEuler/ed25519-java\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.0-5.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "noarch": [
          "ed25519-java-0.3.0-5.oe2403.noarch.rpm",
          "ed25519-java-javadoc-0.3.0-5.oe2403.noarch.rpm",
          "ed25519-java-0.3.0-5.oe2403sp1.noarch.rpm",
          "ed25519-java-javadoc-0.3.0-5.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "ed25519-java-0.3.0-5.oe2403.src.rpm",
          "ed25519-java-0.3.0-5.oe2403sp1.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS",
        "name": "ed25519-java",
        "purl": "pkg:rpm/openEuler/ed25519-java\u0026distro=openEuler-24.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.0-5.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "noarch": [
          "ed25519-java-0.3.0-5.oe2403sp1.noarch.rpm",
          "ed25519-java-javadoc-0.3.0-5.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "ed25519-java-0.3.0-5.oe2403sp1.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "ed25519-java",
        "purl": "pkg:rpm/openEuler/ed25519-java\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.0-5.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "noarch": [
          "ed25519-java-0.3.0-5.oe2003sp4.noarch.rpm",
          "ed25519-java-javadoc-0.3.0-5.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "ed25519-java-0.3.0-5.oe2003sp4.src.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "ed25519-java",
        "purl": "pkg:rpm/openEuler/ed25519-java\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.0-5.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "This is an implementation of EdDSA in Java. Structurally, it is based on the ref10 implementation in SUPERCOP (see http://ed25519.cr.yp.to/software.html). There are two internal implementations: * A port of the radix-2^51 operations in ref10   - fast and constant-time, but only useful for Ed25519. * A generic version using BigIntegers for calculation   - a bit slower and not constant-time, but compatible     with any EdDSA parameter specification.\r\n\r\nSecurity Fix(es):\n\nThe 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.(CVE-2020-36843)",
  "id": "OESA-2025-1334",
  "modified": "2026-08-06T11:08:26Z",
  "published": "2025-03-29T11:08:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1334"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-36843"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ed25519-java security update",
  "upstream": [
    "CVE-2020-36843"
  ]
}

CVE-2020-36843 (GCVE-0-2020-36843)

Vulnerability from cvelistv5 – Published: 2025-03-13 00:00 – Updated: 2025-03-18 16:22

Summary

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-03-18 16:22 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

mitre mitre root

References

2 references

URL	Tags
https://github.com/str4d/ed25519-java/issues/82#i…
https://eprint.iacr.org/2020/1244

Impacted products

1 product

Vendor	Product	Version
str4d	ed25519-java	Affected: 0 , ≤ 0.3.0 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2020-36843",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-03-18T16:22:00.551300Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-03-18T16:22:08.617Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "ed25519-java",
          "vendor": "str4d",
          "versions": [
            {
              "lessThanOrEqual": "0.3.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "CWE-347 Improper Verification of Cryptographic Signature",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-03-13T05:20:08.585Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
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          "url": "https://github.com/str4d/ed25519-java/issues/82#issue-727629226"
        },
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        }
      ],
      "x_generator": {
        "engine": "enrichogram 0.0.1"
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  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2020-36843",
    "datePublished": "2025-03-13T00:00:00.000Z",
    "dateReserved": "2025-03-13T00:00:00.000Z",
    "dateUpdated": "2025-03-18T16:22:08.617Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.