{
  "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-2023-6764",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-6764",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2024-02-20T02:14:09.814Z",
    "updatedAt": "2024-08-02T08:42:07.430Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "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": null,
      "summary": "\n\n\n\n\n\n\n\n\n\n\n\nA format string vulnerability in a function of the IPSec VPN feature in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50 through 5.37 Patch 1, USG FLEX 50(W) series firmware versions from 4.16 through 5.37 Patch 1, and USG20(W)-VPN series firmware versions from 4.16 through 5.37 Patch 1 could allow an attacker to achieve unauthorized remote code execution by sending a sequence of specially crafted payloads containing an invalid pointer; however, such an attack would require detailed knowledge of an affected device’s memory layout and configuration.\n\n\n\n",
      "affected": [
        {
          "vendor": "Zyxel",
          "product": "ATP series firmware",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "version 4.32 through 5.37 Patch 1",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Zyxel",
          "product": "USG FLEX series firmware",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "version 4.50 through 5.37 Patch 1",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Zyxel",
          "product": "USG FLEX 50(W) series firmware",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "version 4.16 through 5.37 Patch 1",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Zyxel",
          "product": "USG20(W)-VPN series firmware",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "version 4.16 through 5.37 Patch 1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}