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CVE-2019-8266

Estado: ModificadaCrítica (9.8)—

UltraVNC revision 1207 has multiple out-of-bounds access vulnerabilities connected with improper usage of ClientConnection::Copybuffer function in VNC client code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. User interaction is required to trigger these vulnerabilities. These vulnerabilities have been fixed in revision 1208.

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)

Uvnc — Ultravnc

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-8266",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.0/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": "vulnerability@kaspersky.com",
      "affectedData": [
        {
          "vendor": "Kaspersky Lab",
          "product": "UltraVNC",
          "versions": [
            {
              "status": "affected",
              "version": "1.2.2.3"
            }
          ]
        }
      ]
    }
  ],
  "published": "2019-03-08T23:29:00.547",
  "references": [
    {
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf",
      "source": "vulnerability@kaspersky.com"
    },
    {
      "url": "https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-013-ultravnc-access-of-memory-location-after-end-of-buffer/",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "vulnerability@kaspersky.com"
    },
    {
      "url": "https://www.us-cert.gov/ics/advisories/icsa-20-161-06",
      "source": "vulnerability@kaspersky.com"
    },
    {
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-013-ultravnc-access-of-memory-location-after-end-of-buffer/",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.us-cert.gov/ics/advisories/icsa-20-161-06",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "vulnerability@kaspersky.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-788"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "UltraVNC revision 1207 has multiple out-of-bounds access vulnerabilities connected with improper usage of ClientConnection::Copybuffer function in VNC client code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. User interaction is required to trigger these vulnerabilities. These vulnerabilities have been fixed in revision 1208."
    },
    {
      "lang": "es",
      "value": "UltraVNC, en su revisión 1207, tiene múltiples vulnerabilidades de acceso fuera de límites conectadas al uso incorrecto de la función ClientConnection::Copybuffer en el código VNC del cliente, lo que podría resultar en una ejecución de código. Este ataque parece ser explotable mediante la conectividad de red. Se requiere la interacción del usuario para desencadenar estas vulnerabilidades. Se han solucionado estas vulnerabilidades en la revisión 1208."
    }
  ],
  "lastModified": "2026-06-17T02:41:46.733",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "555D034F-3D64-4ED1-9B63-F8D59199E99C",
              "versionEndExcluding": "1.2.2.3"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "vulnerability@kaspersky.com"
}