{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361"
            }
          ],
          "repo": "https://github.com/openbmc/phosphor-net-ipmid",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "runZero",
    "cwe_ids": [
      "CWE-457",
      "CWE-798"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16141.json"
  },
  "details": "OpenBMC's IPMI implementation, phosphor-net-ipmid, contains a logic flaw in which an unauthenticated client can force the RAKP Message 1 handler to return before it overwrites the authentication object's constructor defaults. The IPMI service then accepts a RAKP Message 3 whose HMAC is computed with the constant 20-byte 'userKey' initialized from the string '0penBmc' and an often-predictable 'bmcRandomNum'. Several downstream vendors implement phosphor-net-ipmid as their IPMI stack, such as NVIDIA and H3C.",
  "id": "CVE-2026-16141",
  "modified": "2026-10-08T02:31:02.356171138Z",
  "published": "2026-09-15T13:57:28.846Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16141.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-16141"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openbmc/phosphor-net-ipmid"
    },
    {
      "type": "ARTICLE",
      "url": "https://www.runzero.com/blog/lights-out-exposed/"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value"
}