FKIE_CVE-2022-34747

Vulnerability from fkie_nvd - Published: 2022-09-06 02:15 - Updated: 2026-06-17 04:50
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
A format string vulnerability in Zyxel NAS326 firmware versions prior to V5.21(AAZF.12)C0 could allow an attacker to achieve unauthorized remote code execution via a crafted UDP packet.
References
security@zyxel.com.twhttps://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtmlPatch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtmlPatch, Vendor Advisory
Impacted products
Vendor Product Version
zyxel nas326_firmware *
zyxel nas326 -
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Zyxel NAS326 firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c V5.21(AAZF.12)C0"
            }
          ]
        }
      ],
      "source": "security@zyxel.com.tw"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2859006C-00D3-4CF0-B9EF-4CEDD737CF98",
              "versionEndExcluding": "5.21\\(aazf.12\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:nas326:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "E0A01B19-4A91-4FBC-8447-2E854346DAC5",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A format string vulnerability in Zyxel NAS326 firmware versions prior to V5.21(AAZF.12)C0 could allow an attacker to achieve unauthorized remote code execution via a crafted UDP packet."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de cadena de formato en Zyxel NAS326 versiones de firmware anteriores a V5.21(AAZF.12)C0, podr\u00eda permitir a un atacante lograr una ejecuci\u00f3n remota no autorizada de c\u00f3digo por medio de un paquete UDP dise\u00f1ado.\n"
    }
  ],
  "id": "CVE-2022-34747",
  "lastModified": "2026-06-17T04:50:51.437",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "security@zyxel.com.tw",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2022-09-06T02:15:07.517",
  "references": [
    {
      "source": "security@zyxel.com.tw",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtml"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://www.zyxel.com/support/Zyxel-security-advisory-for-format-string-vulnerability-in-NAS.shtml"
    }
  ],
  "sourceIdentifier": "security@zyxel.com.tw",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-134"
        }
      ],
      "source": "security@zyxel.com.tw",
      "type": "Secondary"
    },
    {
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          "lang": "en",
          "value": "CWE-134"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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