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CERT Coordination Center

Mozilla denial of service vulnerability

Vulnerability Note VU#427972

Original Release Date: 2007-01-18 | Last Revised: 2007-06-04


Certain Mozilla products contain a denial-of-service vulnerability.


Certain Mozilla products contain a denial-of-service vulnerability that occurs because of an infinite loop in the js_dtoa function. Mozilla Firefox versions prior to, Thunderbird prior to, and other Mozilla products may be affected.

According to Mozilla Foundation Security Advisory 2006-68:
Keith Victor reported that if the floating point precision of the CPU was reduced (which can happen on windows by loading a plugin which creates a Direct3D device) then it is possible that js_dtoa() will not exit and instead overwrite memory. None of the most common plugins in use do this which lowers the overall impact of this vulnerability to moderate.


A remote unauthenticated attacker may be able to cause a denial-of-service condition.



The Mozilla Foundation has released upgrades that address this issue. See Mozilla Foundation Security Advisory 2006-68 for more information.

Vendor Information

Affected   Unknown   Unaffected


Updated:  December 21, 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.


See Mozilla Foundation Security Advisory 2006-68.

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 Igor Bukanov, Jesse Ruderman, moz_bug_r_a4, Mozilla for providing information that was used in this report.

This document was written by Ryan Giobbi.

Other Information

CVE IDs: CVE-2006-6499
Severity Metric: 0.30
Date Public: 2006-12-19
Date First Published: 2007-01-18
Date Last Updated: 2007-06-04 14:16 UTC
Document Revision: 41

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