CVE-2006-3873

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

29.4% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2006-09-12 23:07 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:27 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 29.4% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2006-09-12 23:07 UTC

Last modified

2026-06-16 22:27 UTC

Exploit probability

29.4% · EPSS, next 30 days

Record status

Modified

Affected

• Microsoft Ie 6.0
• Microsoft Windows 2000
• Microsoft Windows 2003 Server 64-bit
• Microsoft Windows 2003 Server Itanium
• Microsoft Windows 2003 Server r2
• Microsoft Windows 2003 Server sp1
• Microsoft Windows Xp

Attack profile CVSS 2.0 · 7.5

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2006-3873.md and follow it. Check whether this project is affected by CVE-2006-3873. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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