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CVE-2009-0551

Microsoft Internet Explorer - Browser Engine

Microsoft CVSS 8.1 Updated April 30, 2026

Executive Risk Summary

"A memory corruption vulnerability exists in Microsoft Internet Explorer due to improper handling of transition errors in HTTP requests, allowing remote attackers to execute arbitrary code. This vulnerability affects various versions of Internet Explorer on different Windows operating systems."

Anticipated Attack Path

  1. 1. Initial Exploitation: Attacker crafts malicious web pages or inline content to exploit the vulnerability
  2. 2. Privilege Escalation: Exploited code executes with the privileges of the current user
  3. 3. Lateral Movement: Attacker potentially moves laterally within the network using the compromised system

Am I Vulnerable?

  • Verify the version of Internet Explorer installed on the system
  • Check for the presence of the vulnerability using a vulnerability scanner
  • Apply the patch provided by Microsoft to remediate the vulnerability

Operational Audit Arsenal

Target Type Process
Target Asset iexplore.exe
Standard Path C:\Program Files\Internet Explorer
PowerShell
# 🛠️ Senior Engineer Universal Audit
# Target: iexplore.exe (Process)
$Targets = 'iexplore.exe'
$SearchPaths = @("$env:windir\System32", "$env:ProgramFiles", "${env:ProgramFiles(x86)}")

Get-ChildItem -Path $SearchPaths -Include $Targets -Recurse -ErrorAction SilentlyContinue | 
Select-Object FullName, @{Name="Version";Expression={$_.VersionInfo.ProductVersion}}

Patch Impact Forecast

Reboot Required Likely

Minimal, but may require restarting Internet Explorer

Internal Work Notes

Apply MS09-014 patch to vulnerable Internet Explorer installations to prevent remote code execution attacks

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Intelligence Sources

Related Microsoft Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.