CVE-2010-0491: Microsoft Internet Explorer

High severity, CVSS 9.3. EPSS: 29.3% chance of exploitation in the next 30 days.

Use-after-free vulnerability in Microsoft Internet Explorer 5.01 SP4, 6, and 6 SP1 allows remote attackers to execute arbitrary code by changing unspecified properties of an HTML object that has an onreadystatechange event handler, aka "HTML Object Memory Corruption Vulnerability."

Affected products

• Microsoft Internet Explorer: version 6 only; version 5.01 only
• Microsoft Windows 2000: any version
• Microsoft Windows 2003 Server: any version
• Microsoft Windows Server 2003: any version
• Microsoft Windows XP: any version; affected versions not specified

Published 2010-03-31. Last modified 2026-06-16.