CVE-2011-1998: Microsoft Internet Explorer

High severity, CVSS 9.3. EPSS: 21.2% chance of exploitation in the next 30 days.

Microsoft Internet Explorer 9 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that was not properly initialized, aka "Jscript9.dll Remote Code Execution Vulnerability."

Affected products

• Microsoft Internet Explorer: version 9 only

Published 2011-10-12. Last modified 2026-06-16.