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CVE-2012-4787

Microsoft Internet Explorer - Browser Engine

Microsoft CVSS 9 Updated April 30, 2026

Executive Risk Summary

"A use-after-free vulnerability in Microsoft Internet Explorer 9 and 10 allows remote attackers to execute arbitrary code via a crafted web site. This vulnerability can be exploited by an attacker to gain control of the affected system."

Anticipated Attack Path

  1. 1. Initial Exploitation: Attacker crafts a malicious web site to exploit the use-after-free vulnerability
  2. 2. Privilege Escalation: Exploited code executes with the privileges of the current user
  3. 3. Lateral Movement: Attacker uses the compromised system to move laterally within the network

Am I Vulnerable?

  • Verify that Internet Explorer 9 or 10 is installed and not patched
  • Check for suspicious web site traffic or unusual system behavior
  • Monitor system logs for signs of exploitation or malicious activity

Operational Audit Arsenal

Target Type Process
Target Asset iexplore.exe
Standard Path C:\Program Files\Internet Explorer\iexplore.exe
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

Moderate, as the patch may require a system restart and may affect running applications

Internal Work Notes

Apply MS12-077 patch to Internet Explorer 9 and 10 to mitigate use-after-free vulnerability, potentially requiring a system restart and affecting running applications. PowerShell audit one-liner: Get-HotFix -Id KB2789642

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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.