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CVE-2026-20353

Estado: Pendiente de análisisCrítica (9.8)—

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-20353 are related to issues with improper control of a resource through its lifetime that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-664.

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.

Vector CVSS red sin autenticación (AV:N/PR:N/UI:N) indica vulnerabilidad en aplicación expuesta (T1190). CWE-664 (improper resource control) en gateway de email sugiere ejecución de código, acceso a datos y manipulación, típicos en equipos de seguridad perimetral comprometidos.

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 ManagementVulnerability ScanningRestrict Web-Based ContentRestrict File and Directory PermissionsRemote Data StorageNetwork Segmentation

Tecnologías afectadas (2)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Cisco — Secure Email AND WEB ManagerAICisco — Secure Email GatewayAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-20353",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-20353",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-14T00:00:00+00:00"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "psirt@cisco.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@cisco.com",
      "affectedData": [
        {
          "vendor": "Cisco",
          "product": "Cisco Secure Email",
          "versions": [
            {
              "status": "affected",
              "version": "14.0.0-698"
            },
            {
              "status": "affected",
              "version": "13.5.1-277"
            },
            {
              "status": "affected",
              "version": "13.0.0-392"
            },
            {
              "status": "affected",
              "version": "14.2.0-620"
            },
            {
              "status": "affected",
              "version": "13.0.5-007"
            },
            {
              "status": "affected",
              "version": "13.5.4-038"
            },
            {
              "status": "affected",
              "version": "14.2.1-020"
            },
            {
              "status": "affected",
              "version": "14.3.0-032"
            },
            {
              "status": "affected",
              "version": "15.0.0-104"
            },
            {
              "status": "affected",
              "version": "15.0.1-030"
            },
            {
              "status": "affected",
              "version": "15.5.0-048"
            },
            {
              "status": "affected",
              "version": "15.5.1-055"
            },
            {
              "status": "affected",
              "version": "15.5.2-018"
            },
            {
              "status": "affected",
              "version": "16.0.0-050"
            },
            {
              "status": "affected",
              "version": "15.0.3-002"
            },
            {
              "status": "affected",
              "version": "16.0.0-054"
            },
            {
              "status": "affected",
              "version": "15.5.3-022"
            },
            {
              "status": "affected",
              "version": "16.0.1-017"
            },
            {
              "status": "affected",
              "version": "15.5.4-012"
            },
            {
              "status": "affected",
              "version": "16.0.4-016"
            },
            {
              "status": "affected",
              "version": "15.0.5-016"
            },
            {
              "status": "affected",
              "version": "16.0.2-112"
            },
            {
              "status": "affected",
              "version": "16.0.3-044"
            }
          ],
          "defaultStatus": "unknown"
        }
      ]
    }
  ],
  "published": "2026-09-14T17:17:43.000",
  "references": [
    {
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm",
      "source": "psirt@cisco.com"
    },
    {
      "url": "https://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identification",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@cisco.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-664"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20353 are related to issues with improper control of a resource through its lifetime that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-664."
    }
  ],
  "lastModified": "2026-09-15T18:17:19.887",
  "sourceIdentifier": "psirt@cisco.com"
}