Vulnerability Note VU#394444

Microsoft Hyperlink Object Library stack buffer overflow

Original Release date: 21 Jun 2006 | Last revised: 22 Aug 2006


The Microsoft Windows system library for handling hyperlinks contains a buffer overflow. Exploitation of this vulnerability may allow an attacker to execute arbitrary code.


Microsoft Hyperlink Object Library (HLINK.DLL)

The Hyperlink Object Library provides interfaces for handling hyperlinks. More information is available in the Microsoft Hyperlinks Guide.

The Problem

There is a stack-based buffer overflow in the Microsoft Hyperlink Object Library. The overflow may be triggered by clicking a specially crafted hyperlink. Note that any program that links to the HLINK.DLL library may be vulnerable, including Microsoft Office applications.

Exploit code for this vulnerability is publicly available.


By convincing a user to access a specially crafted hyperlink, an attacker could execute arbitrary code with the privileges of the attacked user. If the user is logged in with administrative privileges, the attacker could take complete control of a vulnerable system.


Apply update from Microsoft
This issue is addressed in Microsoft Security Bulletin MS06-050.

Do not follow unsolicited hyperlinks

Do not click on unsolicited links received in email or embedded in Office documents. Exploitation of this vulnerability requires a user to click a specially crafted link. By only accessing hyperlinks from known and trusted sources, the chances of exploitation are reduced.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Microsoft CorporationAffected21 Jun 200622 Aug 2006
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



This vulnerability was reported by kcope.

This document was written by Jeff Gennari.

Other Information

  • CVE IDs: CVE-2006-3086
  • Date Public: 18 Jun 2006
  • Date First Published: 21 Jun 2006
  • Date Last Updated: 22 Aug 2006
  • Severity Metric: 37.50
  • Document Revision: 59


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