Security advisory

{
  "id": "72e51dbd9d205bc9e35c6373848169c6d538e742f747d0a700e772e4d79ae695",
  "url": "https://osv.dev/vulnerability/CVE-2020-24387",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-24387",
    "summary": "An issue was discovered in the yh_create_session() function of yubihsm-shell through 2.0.2. The function does not explicitly check the returned session id from the device. An invalid session id would lead to out-of-bounds read and write operations in the session array. This could be used by an attacker to cause a denial of service attack.",
    "evidence": "osv:CVE-2020-24387",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-24387",
      "aliases": [
        "CVE-2020-24387"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/yubico/yubihsm-shell",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "8ada38bdcaa032c0747487fcd72eb7c5267369d1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:yubico:yubihsm-shell:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.0.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.0.2",
            "2.0.1",
            "2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-24387.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:51.412414853Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO/",
        "https://developers.yubico.com/yubihsm-shell/",
        "https://github.com/Yubico/yubihsm-shell",
        "https://www.yubico.com/support/security-advisories/ysa-2020-06/",
        "https://blog.inhq.net/posts/yubico-libyubihsm-vuln/"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "33"
                  },
                  {
                    "last_affected": "33"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-24387",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383957,
  "published_at": "2020-10-19T20:15:12.947+00:00"
}