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CERT Coordination Center

Microsoft scriptlet.typlib ActiveX object unsafe for scripting from Internet Explorer

Vulnerability Note VU#12746

Original Release Date: 2002-03-29 | Last Revised: 2002-03-29


The ActiveX control "scriptlet.typlib" is incorrectly marked "safe for scripting" in Internet Explorer (IE) versions 4.0 and 5.0, when it is actually unsafe for scripting.


There exists a vulnerability in the default installation of an ActiveX control named "scriptlet.typlib," used by developers to create type libraries for Windows Script Components. This ActiveX control allows local files to be created or modified and thus is unsafe for scripting by IE. However, it is incorrectly marked "safe for scripting" in IE versions 4.0 and 5.0 for Windows.


Any HTML document rendered in IE may call scriptlet.typlib and, without any warning displayed by IE, create or edit files with all permissions of the client user. Such attacks can occur when visiting unfriendly web sites, or rendering embedded HTML in email, newsgroup postings, or even server log entries.


Install the appropriate patches available at:

Disable ActiveX controls in IE.

Vendor Information

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Notified:  August 21, 2001 Updated:  November 17, 2001



Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

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



Thanks to Michael Kelfer for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

CVE IDs: CVE-1999-0668
Severity Metric: 1.85
Date Public: 1999-08-21
Date First Published: 2002-03-29
Date Last Updated: 2002-03-29 22:56 UTC
Document Revision: 20

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