search menu icon-carat-right cmu-wordmark

CERT Coordination Center

Mozilla Firefox designMode deleted object reference

Vulnerability Note VU#866300

Original Release Date: 2006-05-02 | Last Revised: 2006-05-18


Mozilla Firefox contains a deleted object reference vulnerability. This may allow a remote attacker to execute arbitrary code.


Mozilla Firefox contains a vulnerability that causes a deleted object to be referenced when designMode is set to "on." When Firefox attempts to use this deleted object, the browser can crash. It may be possible to execute arbitrary code by using references to deleted objects.


A remote, unauthenticated attacker may be able to execute arbitrary code with the privileges of the user running Firefox.


Apply an update

Update to Firefox, as specified in Mozilla Foundation Security Advisory 2006-30.

Disable scripting

This vulnerability can be mitigated by disabling JavaScript.

Vendor Information

Affected   Unknown   Unaffected

Mozilla, Inc.

Updated:  May 02, 2006



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.


Please see Mozilla Foundation Security Advisory 2006-30.

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

Red Hat, Inc.

Updated:  May 18, 2006


  Not Vulnerable

Vendor Statement

This issue only affected version 1.5 of Firefox. All Red Hat Enterprise
Linux releases shipped with Firefox versions prior to 1.5 and are not
vulnerable to this issue.

Vendor Information

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

CVSS Metrics

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



This vulnerability was publicly disclosed by splices. Mozilla also credits Martijn Wargers and Nick Mott.

This document was written by Will Dormann.

Other Information

CVE IDs: CVE-2006-1993
Severity Metric: 7.88
Date Public: 2006-04-24
Date First Published: 2006-05-02
Date Last Updated: 2006-05-18 19:47 UTC
Document Revision: 16

Sponsored by CISA.