Security advisory

{
  "id": "49b9105e729ac5e53f419c545dee63d0d951ecaca414c238df851453adbe1722",
  "url": "https://osv.dev/vulnerability/CVE-2021-25835",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-25835",
    "summary": "Cosmos Network Ethermint <= v0.4.0 is affected by a cross-chain transaction replay vulnerability in the EVM module. Since ethermint uses the same chainIDEpoch and signature schemes with ethereum for compatibility, a verified signature in ethereum is still valid in ethermint with the same msg content and chainIDEpoch, which enables \"cross-chain transaction replay\" attack.",
    "evidence": "osv:CVE-2021-25835",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-25835",
      "aliases": [
        "CVE-2021-25835",
        "GHSA-x5f3-qmwj-4f84",
        "GO-2022-0889"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cosmos/ethermint",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "11e2f636787f453dac645b53e6b930d42bbb8711"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:chainsafe:ethermint:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.4.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.4.0",
            "v0.3.0",
            "v0.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-25835.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:40.332889687Z",
      "provider": "osv",
      "references": [
        "https://github.com/cosmos/ethermint/issues/687",
        "https://github.com/cosmos/ethermint/pull/692"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-25835",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384478,
  "published_at": "2021-02-08T18:15:13.803+00:00"
}