Security advisory

{
  "id": "e6e2ade0c6cc7712b5f42f2b3e8efc81c7d7a060ed42cb58e7f3b8ab1faf7296",
  "url": "https://osv.dev/vulnerability/CVE-2020-11683",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-11683",
    "summary": "A timing side channel was discovered in AT91bootstrap before 3.9.2. It can be exploited by attackers with physical access to forge CMAC values and subsequently boot arbitrary code on an affected system.",
    "evidence": "osv:CVE-2020-11683",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-11683",
      "aliases": [
        "CVE-2020-11683"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/linux4sam/at91bootstrap",
              "type": "GIT",
              "events": [
                {
                  "introduced": "533f4082e35869ab61d1112f518063aa0496febb"
                },
                {
                  "fixed": "959a75951a8a8feddef210470cb9aca2c9bdcb5a"
                },
                {
                  "fixed": "7753914c9a622c245f3a3cf2af5e24b6a9904213"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:linux4sam:at91bootstrap:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.7.2"
                      },
                      {
                        "fixed": "3.9.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7753914c9a622c245f3a3cf2af5e24b6a9904213"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.9.1",
            "v3.9.1-rc1",
            "v3.9.0",
            "v3.9.0-rc5",
            "v3.9.0-rc4",
            "v3.9.0-rc3",
            "v3.9.0-rc2",
            "v3.9.0-rc1",
            "v3.8.13",
            "v3.8.13-rc5",
            "v3.8.13-rc4",
            "v3.8.13-rc3",
            "v3.8.13-rc2",
            "v3.8.13-rc1",
            "v3.8.12",
            "v3.8.11",
            "v3.8.11-rc4",
            "v3.8.11-rc3",
            "v3.8.11-rc1",
            "v3.8.11-rc2",
            "v3.8.10",
            "v3.8.10-rc1",
            "v3.8.9",
            "v3.8.9-rc7",
            "v3.8.9-rc6",
            "v3.8.9-rc4",
            "v3.8.9-rc3",
            "v3.8.9-rc2",
            "v3.8.9-rc1",
            "v3.8.8",
            "v3.8.8-rc3",
            "v3.8.8-rc2",
            "linux4sam_5.6-rc1",
            "v3.8.7",
            "v3.8.6",
            "v3.8.5",
            "v3.8.4",
            "v3.8.3",
            "v3.8.2",
            "v3.8.1",
            "v3.8",
            "v3.8-beta1",
            "v3.8-alpha7",
            "v3.8-alpha6",
            "v3.8-alpha5",
            "v3.8-alpha4",
            "v3.8-alpha3",
            "v3.8-alpha2",
            "v3.8-alpha1",
            "v3.7.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-11683.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-11683-42df8080",
                "digest": {
                  "length": 824,
                  "function_hash": "255551313002851231383074705359359491684"
                },
                "source": "https://github.com/linux4sam/at91bootstrap/commit/7753914c9a622c245f3a3cf2af5e24b6a9904213",
                "target": {
                  "file": "driver/secure.c",
                  "function": "secure_decrypt"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-11683-5a48e688",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "12594202086834631762248543107474524793",
                    "123321447821046916437788577939218398990",
                    "148445047497956173920580930048544742979",
                    "247867111113196425133876668604870489814"
                  ]
                },
                "source": "https://github.com/linux4sam/at91bootstrap/commit/7753914c9a622c245f3a3cf2af5e24b6a9904213",
                "target": {
                  "file": "driver/secure.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:51:19Z"
          }
        }
      ],
      "modified": "2026-10-20T13:51:19.229749329Z",
      "provider": "osv",
      "references": [
        "https://github.com/linux4sam/at91bootstrap/commit/7753914c9a622c245f3a3cf2af5e24b6a9904213",
        "https://labs.f-secure.com/advisories/microchip-at91bootstrap/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-11683",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388289,
  "published_at": "2020-09-14T14:15:10.617+00:00"
}