CVE-2006-3873: Microsoft Ie

High severity, CVSS 7.5. EPSS: 29.4% chance of exploitation in the next 30 days.

Heap-based buffer overflow in URLMON.DLL in Microsoft Internet Explorer 6 SP1 on Windows 2000 and XP SP1, with versions the MS06-042 patch before 20060912, allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a long URL in a GZIP-encoded website that was the target of an HTTP redirect, due to an incomplete fix for CVE-2006-3869.

Affected products

• Microsoft Ie: version 6.0 only
• Microsoft Windows 2000: any version
• Microsoft Windows 2003 Server: version 64-bit only; version itanium only; version r2 only; version sp1 only
• Microsoft Windows XP: any version

Published 2006-09-12. Last modified 2026-06-16.