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CVE-2011-1999

Status: ModifiedHigh (9.3)—💥 Exploit

Microsoft Internet Explorer 8 does not properly allocate and access memory, which allows remote attackers to execute arbitrary code via vectors involving a "dereferenced memory address," aka "Select Element Remote Code Execution Vulnerability."

CVSS

Exploitation probability (EPSS)

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).

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Affected technologies (1)

Microsoft — Internet Explorer

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2011-1999",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 9.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
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        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
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      "affectedData": [
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          "versions": [
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  ],
  "published": "2011-10-12T02:52:43.737",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/49964",
      "tags": [
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      ],
      "source": "secure@microsoft.com"
    },
    {
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-081",
      "tags": [
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        "Vendor Advisory"
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      "tags": [
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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      "lang": "en",
      "value": "Microsoft Internet Explorer 8 does not properly allocate and access memory, which allows remote attackers to execute arbitrary code via vectors involving a \"dereferenced memory address,\" aka \"Select Element Remote Code Execution Vulnerability.\""
    },
    {
      "lang": "es",
      "value": "Microsoft Internet Explorer v8 no asigna ni accede correctamente a la memoria, lo que permite a atacantes remotos ejecutar código de su elección a través de vectores que implican una \"dirección de memoria no referenciada\". También conocida como \"vulnerabilidad de ejecución remota de código del elemento Select\"."
    }
  ],
  "lastModified": "2026-06-16T23:30:34.450",
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}