{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-35535",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-35535",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2021-11-18T15:53:12.711Z",
    "updatedAt": "2024-09-16T17:42:37.566Z",
    "importedAt": "2026-10-24T01:56:32.228Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Insufficient Security Control Vulnerability",
      "summary": "Insecure Boot Image vulnerability in Hitachi Energy Relion Relion 670/650/SAM600-IO series allows an attacker who manages to get access to the front network port and to cause a reboot sequences of the device may exploit the vulnerability, where there is a tiny time gap during the booting process where an older version of VxWorks is loaded prior to application firmware booting, could exploit the vulnerability in the older version of VxWorks and cause a denial-of-service on the product. This issue affects: Hitachi Energy Relion 670 Series 2.2.2 all revisions; 2.2.3 versions prior to 2.2.3.3. Hitachi Energy Relion 670/650 Series 2.2.0 all revisions; 2.2.4 all revisions. Hitachi Energy Relion 670/650/SAM600-IO 2.2.1 all revisions.",
      "affected": [
        {
          "vendor": "Hitachi Energy",
          "product": "Relion 670 Series",
          "versions": [
            {
              "version": "2.2.2 all revisions",
              "status": "affected"
            },
            {
              "version": "2.2.3",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "2.2.3.3"
            }
          ]
        },
        {
          "vendor": "Hitachi Energy",
          "product": "Relion 670/650 Series",
          "versions": [
            {
              "version": "2.2.0 all revisions",
              "status": "affected"
            },
            {
              "version": "2.2.4 all revisions",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Hitachi Energy",
          "product": "Relion 670/650/SAM600-IO",
          "versions": [
            {
              "version": "2.2.1 all revisions",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}