Security advisory

{
  "id": "7fd807e6d37889569d670cd68de579e0765c3d8bef9119ca38ea4ee9944c9047",
  "url": "https://osv.dev/vulnerability/CVE-2020-6861",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-6861",
    "summary": "A flawed protocol design in the Ledger Monero app before 1.5.1 for Ledger Nano and Ledger S devices allows a local attacker to extract the master spending key by sending crafted messages to this app selected on a PIN-entered Ledger connected to a host PC.",
    "evidence": "osv:CVE-2020-6861",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-6861",
      "aliases": [
        "CVE-2020-6861"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ledgerhq/app-monero",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "63e6831c8062da5c94b96ddca877b397464a582f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ledger:monero:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.5.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.5.0",
            "1.4.2",
            "1.4.1",
            "1.4.0-alpha2",
            "1.4.0-alpha1",
            "1.3.1",
            "1.3.0",
            "1.2.2",
            "1.2.1",
            "1.2.0",
            "1.1.3",
            "1.1.2",
            "1.1.1",
            "1.1.0",
            "1.0.0",
            "Beta5",
            "Beta4",
            "Beta3",
            "Beta2",
            "Beta1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-6861.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-6861-1d54e770",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "101741386905829353390738821569549687821",
                    "229090205630727460719228199548747180290",
                    "22077540944309426620964614272921675852",
                    "285395983083939586261017318037235051181"
                  ]
                },
                "source": "https://github.com/ledgerhq/app-monero/commit/63e6831c8062da5c94b96ddca877b397464a582f",
                "target": {
                  "file": "src/monero_open_tx.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-6861-26b7a063",
                "digest": {
                  "length": 246,
                  "function_hash": "113563531168246943257164532100527837457"
                },
                "source": "https://github.com/ledgerhq/app-monero/commit/63e6831c8062da5c94b96ddca877b397464a582f",
                "target": {
                  "file": "src/monero_open_tx.c",
                  "function": "monero_apdu_open_tx"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-6861-67232e9b",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "45368085189849241846371384634707785861",
                    "76074305106806271853893752226834569509",
                    "336782104617801452773831128018564400872",
                    "76446207293541156956980447980398319837",
                    "126859190297950555234972935200095419835",
                    "16471406417976635148268064813046687011"
                  ]
                },
                "source": "https://github.com/ledgerhq/app-monero/commit/63e6831c8062da5c94b96ddca877b397464a582f",
                "target": {
                  "file": "src/monero_ux_nano.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-6861-bf4f7eb7",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "285884109718157205990155085200126671806",
                    "76074305106806271853893752226834569509",
                    "228578609159770551741535275556781084005",
                    "159287416375869182679674429704463080556",
                    "76446207293541156956980447980398319837",
                    "17034398394533678339953578823210019125",
                    "114072379502219694448221604967310847693"
                  ]
                },
                "source": "https://github.com/ledgerhq/app-monero/commit/63e6831c8062da5c94b96ddca877b397464a582f",
                "target": {
                  "file": "src/monero_ux_nanos.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-24T14:12:08Z"
          }
        }
      ],
      "modified": "2026-10-24T14:12:08.430665392Z",
      "provider": "osv",
      "references": [
        "https://deadcode.me/blog/2020/04/25/Ledger-Monero-app-spend-key-extraction.html",
        "https://donjon.ledger.com/lsb/008/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-6861",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 443333,
  "published_at": "2020-05-06T14:15:11.083+00:00"
}