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Mozilla products allow execution of arbitrary JavaScript

Vulnerability Note VU#714496

Original Release Date: 2006-11-08 | Last Revised: 2006-12-21


Multiple Mozilla products allow running JavaScript to be recompiled while executing. This vulnerability may allow a remote attacker to execute arbitrary JavaScript bytecode.


According to Mozilla Foundation Security Advisory 2006-67: was possible to modify a Script object while it was executing, potentially leading to the execution of arbitrary JavaScript bytecode.
This vulnerability requires JavaScript to be enabled. JavaScript is enabled by default in the Firefox web browser, but not in the Mozilla Thunderbird email client.

Note that this issue affects Mozilla Firefox, Thunderbird, and SeaMonkey. For more information refer to Mozilla Foundation Security Advisory 2006-67.


A remote, unauthenticated attacker may be able to execute arbitrary JavaScript bytecode.


Apply an update
According to the Mozilla Foundation Security Update 2006-67, this vulnerability is addressed in Firefox, Thunderbird, and SeaMonkey 1.0.6.

Disable JavaScript

For instructions on how to disable JavaScript in Firefox, please refer to the Firefox section of the Securing Your Web Browser document.

Vendor Information


Mozilla Affected

Updated:  November 08, 2006



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

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


Refer to

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This vulnerability was reported in Mozilla Foundation Security Advisory 2006-67. Mozilla credits shutdown for providing information concerning this issue.

This document was written by Chris Taschner.

Other Information

CVE IDs: CVE-2006-5463
Severity Metric: 14.04
Date Public: 2006-11-08
Date First Published: 2006-11-08
Date Last Updated: 2006-12-21 18:50 UTC
Document Revision: 25

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