CVE-2010-3962
HighActively exploited (CISA KEV)
Description
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.
SeverityHigh
CVSS8.1
Exploit probability—
Product
Microsoft Internet Explorer
PublishedNov 5, 2010
First seenNov 5, 2010
Added to KEVOct 6, 2025
Weakness typeCWE-416Use after free
How to fix
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: Oct 27, 2025Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft internet_explorer | 6, 7, 8 | — |
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