CVE-2010-3962: Microsoft Internet Explorer Uninitialized Memory Corruption Vulnerability

High severity, CVSS 8.1. Actively exploited: in CISA KEV since 2025-10-06. EPSS: 96.8% chance of exploitation in the next 30 days.

Use-after-free vulnerability in Microsoft Internet Explorer 6, 7, and 8 allows remote attackers to execute arbitrary code via vectors related to Cascading Style Sheets (CSS) token sequences and the clip attribute, aka an "invalid flag reference" issue or "Uninitialized Memory Corruption Vulnerability," as exploited in the wild in November 2010.

Affected products

• Microsoft Internet Explorer: version 6 only; version 7 only; version 8 only

Published 2010-11-05. Last modified 2026-06-16.