{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:yubico:yubihsm-shell:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.0.3"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "a2d66a90426dddac0d2060d2b4fce5c7545a6bc8"
            }
          ],
          "repo": "https://github.com/yubico/yubihsm-shell",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {},
  "details": "An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3. The function does not correctly validate the embedded length field of an authenticated message received from the device. Out-of-bounds reads performed by aes_remove_padding() can crash the running process, depending on the memory layout. This could be used by an attacker to cause a client-side denial of service. The yubihsm-shell project is included in the YubiHSM 2 SDK product.",
  "id": "CVE-2021-27217",
  "modified": "2026-07-08T05:37:34.710727551Z",
  "published": "2021-03-04T18:15:14.050Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/Yubico/yubihsm-shell/releases"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.yubico.com/support/security-advisories/ysa-2021-01/"
    },
    {
      "type": "EVIDENCE",
      "url": "https://blog.inhq.net/posts/yubico-libyubihsm-vuln2"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}