CVE-2023-35139

Estado: ModificadaMedia (6.1)—
A cross-site scripting (XSS) vulnerability in the CGI program of the Zyxel ATP series firmware versions 5.10 through 5.37, USG FLEX series firmware versions 5.00 through 5.37, USG FLEX 50(W) series firmware versions 5.10 through 5.37, USG20(W)-VPN series firmware versions 5.10 through 5.37, and VPN series firmware versions 5.00 through 5.37, could allow an unauthenticated LAN-based attacker to store malicious scripts in a vulnerable device. A successful XSS attack could then result in the stored malicious scripts being executed to steal cookies when the user visits the specific CGI used for dumping ZTP logs.
CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Puntuación base: 6.1
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.46%
Percentil entre todas las CVEs puntuadas: 38
Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)

Zyxel — ZLD
CWE

CWE-79
Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2023-35139",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@zyxel.com.tw",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 5.2,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.1
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@zyxel.com.tw",
      "affectedData": [
        {
          "vendor": "Zyxel",
          "product": "ATP series firmware",
          "versions": [
            {
              "status": "affected",
              "version": "versions 5.10 through 5.37"
            }
          ],
          "defaultStatus": "unaffected"
        },
        {
          "vendor": "Zyxel",
          "product": "USG FLEX series firmware",
          "versions": [
            {
              "status": "affected",
              "version": " versions 5.00 through 5.37"
            }
          ],
          "defaultStatus": "unaffected"
        },
        {
          "vendor": "Zyxel",
          "product": " USG FLEX 50(W) series firmware",
          "versions": [
            {
              "status": "affected",
              "version": "versions 5.10 through 5.37"
            }
          ],
          "defaultStatus": "unaffected"
        },
        {
          "vendor": "Zyxel",
          "product": "USG20(W)-VPN series firmware",
          "versions": [
            {
              "status": "affected",
              "version": " versions 5.10 through 5.37"
            }
          ],
          "defaultStatus": "unaffected"
        },
        {
          "vendor": "Zyxel",
          "product": "VPN series firmware",
          "versions": [
            {
              "status": "affected",
              "version": "versions 5.00 through 5.37"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2023-11-28T02:15:42.347",
  "references": [
    {
      "url": "https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@zyxel.com.tw"
    },
    {
      "url": "https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@zyxel.com.tw",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A cross-site scripting (XSS) vulnerability in the CGI program of the Zyxel ATP series firmware versions 5.10 through 5.37, USG FLEX series firmware versions 5.00 through 5.37, USG FLEX 50(W) series firmware versions 5.10 through 5.37, USG20(W)-VPN series firmware versions 5.10 through 5.37, and VPN series firmware versions 5.00 through 5.37, could allow an unauthenticated LAN-based attacker to store malicious scripts in a vulnerable device. A successful XSS attack could then result in the stored malicious scripts being executed to steal cookies when the user visits the specific CGI used for dumping ZTP logs."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de Cross Site Scripting (XSS) en el programa CGI de las versiones de firmware:\nserie Zyxel ATP 5.10 a 5.37,\nserie USG FLEX 5.00 a 5.37, \nserie USG FLEX 50(W) 5.10 a 5.37, USG20(W), \nserie VPN 5.10 a 5.37 y \nserie VPN 5.00 a 5.37.\nPodrían permitir que un atacante basado en LAN no autenticado almacene scripts maliciosos en un dispositivo vulnerable. Un ataque XSS exitoso podría resultar en la ejecución de scripts maliciosos almacenados para robar cookies cuando el usuario visita el CGI específico utilizado para volcar registros ZTP."
    }
  ],
  "lastModified": "2026-06-17T06:04:28.327",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A959A961-FE39-4743-BCFB-700131DE4372",
              "versionEndIncluding": "5.37",
              "versionStartIncluding": "5.10"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "7F7654A1-3806-41C7-82D4-46B0CD7EE53B"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:atp100w:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "47398FD0-6C5E-4625-9EFD-DE08C9AB7DB2"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "D68A36FF-8CAF-401C-9F18-94F3A2405CF4"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "2818E8AC-FFEE-4DF9-BF3F-C75166C0E851"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:atp700:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "0B41F437-855B-4490-8011-DF59887BE6D5"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "66B99746-0589-46E6-9CBD-F38619AD97DC"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "78B5CDFF-8571-4232-AC38-8E4AD12F683B",
              "versionEndIncluding": "5.37",
              "versionStartIncluding": "5.00"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "2B30A4C0-9928-46AD-9210-C25656FB43FB"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "D74ABA7E-AA78-4A13-A64E-C44021591B42"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "F93B6A06-2951-46D2-A7E1-103D7318D612"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:usg_flex_50:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "646C1F07-B553-47B0-953B-DC7DE7FD0F8B"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "92C697A5-D1D3-4FF0-9C43-D27B18181958"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:usg_flex_50w:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "110A1CA4-0170-4834-8281-0A3E14FC5584"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "9D1396E3-731B-4D05-A3F8-F3ABB80D5C29"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A959A961-FE39-4743-BCFB-700131DE4372",
              "versionEndIncluding": "5.37",
              "versionStartIncluding": "5.10"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:usg_20w-vpn:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "6BEA412F-3DA1-4E91-9C74-0666147DABCE"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:vpn50w:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "371CE32A-C28E-44D2-9B0B-D8775928FD0E"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "78B5CDFF-8571-4232-AC38-8E4AD12F683B",
              "versionEndIncluding": "5.37",
              "versionStartIncluding": "5.00"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "81D90A7B-174F-40A1-8AF4-08B15B7BAC40"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:vpn1000:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "EECD311A-4E96-4576-AADF-47291EDE3559"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "3C45C303-1A95-4245-B242-3AB9B9106CD4"
            },
            {
              "criteria": "cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "9E3AC823-0ECA-42D8-8312-2FBE5914E4C0"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "sourceIdentifier": "security@zyxel.com.tw"
}