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CVE-2025-53843

Estado: ModificadaAlta (7.5)—

A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions allows attacker to execute unauthorized code or commands via specially crafted packets

CVSS

Probabilidad de explotación (EPSS)

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Stack buffer overflow (CWE-121) en servicio remoto FortiOS; AV:N + PR:L indica acceso remoto con privilegios locales (T1210). Permite ejecución de código (T1059) según descripción.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementDisable or Remove Feature or ProgramVulnerability ScanningThreat Intelligence ProgramRestrict Web-Based ContentNetwork Segmentation

Tecnologías afectadas (1)

Fortinet — Fortios

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-53843",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-53843",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-11-19T04:55:32.869143Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "psirt@fortinet.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.6
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@fortinet.com",
      "affectedData": [
        {
          "cpes": [
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            "cpe:2.3:o:fortinet:fortios:7.2.0:*:*:*:*:*:*:*",
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            "cpe:2.3:o:fortinet:fortios:7.0.15:*:*:*:*:*:*:*",
            "cpe:2.3:o:fortinet:fortios:7.0.14:*:*:*:*:*:*:*",
            "cpe:2.3:o:fortinet:fortios:7.0.13:*:*:*:*:*:*:*",
            "cpe:2.3:o:fortinet:fortios:7.0.12:*:*:*:*:*:*:*",
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            "cpe:2.3:o:fortinet:fortios:7.0.2:*:*:*:*:*:*:*",
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          ],
          "vendor": "Fortinet",
          "product": "FortiOS",
          "versions": [
            {
              "status": "affected",
              "version": "7.6.0",
              "versionType": "semver",
              "lessThanOrEqual": "7.6.3"
            },
            {
              "status": "affected",
              "version": "7.4.0",
              "versionType": "semver",
              "lessThanOrEqual": "7.4.8"
            },
            {
              "status": "affected",
              "version": "7.2.0",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.12"
            },
            {
              "status": "affected",
              "version": "7.0.0",
              "versionType": "semver",
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              "status": "affected",
              "version": "6.4.0",
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              "lessThanOrEqual": "6.4.16"
            }
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          "defaultStatus": "unaffected"
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    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "affectedData": [
        {
          "vendor": "Siemens",
          "product": "RUGGEDCOM APE1808",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        }
      ]
    }
  ],
  "published": "2025-11-18T17:16:03.033",
  "references": [
    {
      "url": "https://fortiguard.fortinet.com/psirt/FG-IR-25-358",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@fortinet.com"
    },
    {
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-864900.html",
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@fortinet.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-121"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions allows attacker to execute unauthorized code or commands via specially crafted packets"
    }
  ],
  "lastModified": "2026-06-17T09:39:01.043",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "7.4.9",
              "versionStartIncluding": "6.4.0"
            },
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            }
          ],
          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "psirt@fortinet.com"
}