CVE-2012-2523: Microsoft Internet Explorer

High severity, CVSS 9.3. EPSS: 22.2% chance of exploitation in the next 30 days.

Integer overflow in Microsoft Internet Explorer 8 and 9, JScript 5.8, and VBScript 5.8 on 64-bit platforms allows remote attackers to execute arbitrary code by leveraging an incorrect size calculation during object copying, aka "JavaScript Integer Overflow Remote Code Execution Vulnerability."

Affected products

• Microsoft Internet Explorer: version 8 only; version 9 only
• Microsoft Jscript: version 5.8 only
• Microsoft Vbscript: version 5.8 only

Published 2012-08-15. Last modified 2026-06-16.