CVE-2012-4787: Microsoft Internet Explorer

Critical severity, CVSS 9.0. EPSS: 17.6% chance of exploitation in the next 30 days.

Use-after-free vulnerability in Microsoft Internet Explorer 9 and 10 allows remote attackers to execute arbitrary code via a crafted web site that triggers access to an object that (1) was not properly initialized or (2) is deleted, aka "Improper Ref Counting Use After Free Vulnerability."

Affected products

• Microsoft Internet Explorer: version 9 only; version 10 only

Published 2012-12-12. Last modified 2026-06-16.