CVE-2010-3971: Microsoft Internet Explorer

High severity, CVSS 9.3. EPSS: 81.7% chance of exploitation in the next 30 days.

Use-after-free vulnerability in the CSharedStyleSheet::Notify function in the Cascading Style Sheets (CSS) parser in mshtml.dll, as used in Microsoft Internet Explorer 6 through 8 and other products, allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a self-referential @import rule in a stylesheet, aka "CSS Memory Corruption Vulnerability."

Affected products

• Microsoft Internet Explorer: version 7 only; version 8 only

Published 2010-12-22. Last modified 2026-06-16.