{
  "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-2021-21005",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-21005",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2021-06-25T18:25:53.099Z",
    "updatedAt": "2024-09-17T02:17:13.899Z",
    "importedAt": "2026-10-24T01:56:26.894Z",
    "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": "Race Condition Vulnerability in Phoenix Contact FL SWITCH SMCS series products",
      "summary": "In Phoenix Contact FL SWITCH SMCS series products in multiple versions if an attacker sends a hand-crafted TCP-Packet with the Urgent-Flag set and the Urgent-Pointer set to 0, the network stack will crash. The device needs to be rebooted afterwards.",
      "affected": [
        {
          "vendor": "Phoenix Contact",
          "product": "FL SWITCH",
          "versions": [
            {
              "version": "SMCS 16TX (2700996)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMCS 14TX/2FX (2700997)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMCS 14TX/2FX-SM (2701466)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMCS 8GT (2891123)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMCS 6GT/2SFP (2891479)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMCS 8TX-PN (2989103)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMCS 4TX-PN (2989093)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMCS 8TX (2989226)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMCS 6TX/2SFP (2989323)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMN 6TX/2POF-PN (2700290)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMN 8TX-PN (2989501)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMN 6TX/2FX (2989543)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            },
            {
              "version": "SMN 6TX/2FX SM (2989556)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.70"
            }
          ]
        },
        {
          "vendor": "Phoenix Contact",
          "product": "FL NAT",
          "versions": [
            {
              "version": "SMN 8TX (2989365)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.63"
            },
            {
              "version": "SMN 8TX-M (2702443)",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "4.63"
            }
          ]
        }
      ]
    }
  }
}