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CVE-2023-28807

Estado: ModificadaAlta (7.5)—

In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic.

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).

Tecnologías afectadas (1)

Zscaler — Secure Internet AND Saas Access

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2023-28807",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-28807",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-03-14T21:06:39.806468Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "cve@zscaler.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.1,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 2.5
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
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      "affectedData": [
        {
          "vendor": "Zscaler",
          "product": "ZIA",
          "versions": [
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              "version": "0",
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              "versionType": "custom"
            }
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          "defaultStatus": "unaffected"
        }
      ]
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  ],
  "published": "2024-01-31T20:15:44.903",
  "references": [
    {
      "url": "https://help.zscaler.com/zia/configuring-advanced-settings#dns-optimization",
      "tags": [
        "Product"
      ],
      "source": "cve@zscaler.com"
    },
    {
      "url": "https://help.zscaler.com/zia/configuring-advanced-settings#domain-fronting",
      "tags": [
        "Product"
      ],
      "source": "cve@zscaler.com"
    },
    {
      "url": "https://help.zscaler.com/zia/configuring-advanced-settings#dns-optimization",
      "tags": [
        "Product"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://help.zscaler.com/zia/configuring-advanced-settings#domain-fronting",
      "tags": [
        "Product"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cve@zscaler.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic."
    },
    {
      "lang": "es",
      "value": "En Zscaler Internet Access (ZIA), una falta de coincidencia entre Connect Host y Client Hello's Server Name Indication (SNI) permite a los atacantes evadir los controles de seguridad de la red ocultando sus comunicaciones dentro del tráfico legítimo."
    }
  ],
  "lastModified": "2026-06-17T05:48:48.877",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:zscaler:secure_internet_and_saas_access:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4DC095FA-C0CB-4E6F-B749-8DB0308F9C1C",
              "versionEndExcluding": "6.2r.290"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@zscaler.com"
}