CVE-2008-4770

Status: ModifiedHigh (10)—
The CMsgReader::readRect function in the VNC Viewer component in RealVNC VNC Free Edition 4.0 through 4.1.2, Enterprise Edition E4.0 through E4.4.2, and Personal Edition P4.0 through P4.4.2 allows remote VNC servers to execute arbitrary code via crafted RFB protocol data, related to "encoding type."
CVSS

Version: 2.0
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Base score: 10
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 4.05%
Percentile among all scored CVEs: 90
Score date: 10/5/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)

Realvnc — Realvnc
CWEs

CWE-20
References

Raw JSON (NVD)

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{
  "id": "CVE-2008-4770",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 10,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": true,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2009-01-16T21:30:03.327",
  "references": [
    {
      "url": "http://secunia.com/advisories/32317",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://secunia.com/advisories/33689",
      "source": "cve@mitre.org"
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      "source": "cve@mitre.org"
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    {
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    {
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      "source": "cve@mitre.org"
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    {
      "url": "https://www.redhat.com/archives/fedora-package-announce/2009-January/msg01025.html",
      "source": "cve@mitre.org"
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    {
      "url": "http://secunia.com/advisories/32317",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://secunia.com/advisories/33689",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://secunia.com/advisories/34184",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://sunsolve.sun.com/search/document.do?assetkey=1-21-140455-01-1",
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "http://www.gentoo.org/security/en/glsa/glsa-200903-17.xml",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "http://www.realvnc.com/pipermail/vnc-list/2008-November/059432.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.realvnc.com/products/free/4.1/release-notes.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "http://www.realvnc.com/products/upgrade.html",
      "tags": [
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      "url": "http://www.redhat.com/support/errata/RHSA-2009-0261.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/31832",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/33263",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.vupen.com/english/advisories/2008/2868",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/45969",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/47937",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9367",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.redhat.com/archives/fedora-package-announce/2009-January/msg01025.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The CMsgReader::readRect function in the VNC Viewer component in RealVNC VNC Free Edition 4.0 through 4.1.2, Enterprise Edition E4.0 through E4.4.2, and Personal Edition P4.0 through P4.4.2 allows remote VNC servers to execute arbitrary code via crafted RFB protocol data, related to \"encoding type.\""
    },
    {
      "lang": "es",
      "value": "La función CMsgReader::readRect en el componente VNC Viewer en RealVNC VNC Free Edition v4.0 hasta v4.1.2, Enterprise Edition vE4.0 hasta vE4.4.2, y Personal Edition vP4.0 hasta vP4.4.2 permite a servidores remotos VNC ejecutar código de su elección mediante el protocolo de datos RFB manipulado, relacionado con \"tipo codificado\"."
    }
  ],
  "lastModified": "2026-06-16T22:58:30.443",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:realvnc:realvnc:4.0:*:free:*:*:*:*:*",
              "vulnerable": true,
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            },
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              "vulnerable": true,
              "matchCriteriaId": "1D102EDC-3B06-4880-8A93-155562A2B209"
            },
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            },
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              "matchCriteriaId": "5140685C-E1CF-4B07-82DE-EAD311994E7B"
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          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}