Security advisory

{
  "id": "f42144a4fb08617cf7d04f74bacec3373c8dcd04cfc918d6957ae0b12320bdee",
  "url": "https://osv.dev/vulnerability/CVE-2020-10185",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-10185",
    "summary": "The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP. NOTE: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.",
    "evidence": "osv:CVE-2020-10185",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-10185",
      "aliases": [
        "CVE-2020-10185"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/yubico/yubikey-val",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "19345b76eea90d1cb3996296c12ae616d8151c22"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:yubico:yubikey_one_time_password_validation_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.40"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "19345b76eea90d1cb3996296c12ae616d8151c22"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "yubikey-val-2.40"
                  }
                ]
              }
            }
          ],
          "versions": [
            "yubikey-val-2.39",
            "yubikey-val-2.38",
            "yubikey-val-2.37",
            "yubikey-val-2.36",
            "yubikey-val-2.35",
            "yubikey-val-2.34",
            "yubikey-val-2.33",
            "yubikey-val-2.32",
            "yubikey-val-2.31",
            "yubikey-val-2.30",
            "yubikey-val-2.29",
            "yubikey-val-2.28",
            "yubikey-val-2.27",
            "yubikey-val-2.26",
            "yubikey-val-2.25",
            "yubikey-val-2.24",
            "yubikey-val-2.23",
            "yubikey-val-2.22",
            "yubikey-val-2.21",
            "yubikey-val-2.20",
            "yubikey-val-2.19",
            "yubikey-val-2.18",
            "yubikey-val-2.17",
            "yubikey-val-2.16",
            "yubikey-val-2.13",
            "yubikey-val-2.12"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-10185.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:34.811704306Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2020/03/msg00014.html",
        "https://github.com/Yubico/yubikey-val/releases/tag/yubikey-val-2.40",
        "https://www.yubico.com/support/security-advisories/ysa-2020-01/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-10185",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 382596,
  "published_at": "2020-03-05T23:15:13.353+00:00"
}