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CERT Coordination Center

Microsoft Internet Explorer (IE) permits modification of URL displayed in address bar

Vulnerability Note VU#988768

Original Release Date: 2001-06-07 | Last Revised: 2001-06-07


A vulnerability exists in Microsoft Internet Explorer which could could enable an attacker to spoof trusted web sites.


A vulnerability exists in Microsoft Internet Explorer. This vulnerability could enable a web page to display the URL
from a different web site in the IE address bar. This spoofing could occur within a valid SSL session with the impersonated site, meaning that a web site operator could make it appear that the content from his or her Web site actually originated from another site, even a trusted or secure Web site, when in fact, it did not.


More information on this problem is available from Microsoft at:


This vulnerability could be used to convince a user that the intruder's web site was actually a different one - a web site that the user
trusts and might provide sensitive information to.


Apply the patch described in

Vendor Information

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Updated:  June 05, 2001



Vendor Statement

Microsoft has published a security document regarding this vulnerability, the contents of which can be found at

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

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



Our thanks to Microsoft for the information contained in their bulletin.

This document was written by Ian A. Finlay and is based on information obtained from a Microsoft Security Advisory.

Other Information

CVE IDs: CVE-2001-0339
Date Public: 2001-05-17
Date First Published: 2001-06-07
Date Last Updated: 2001-06-07 19:24 UTC
Document Revision: 22

Sponsored by the Department of Homeland Security Office of Cybersecurity and Communications.