Description:
Michal Zalewski has discovered a weakness in Firefox, which can be exploited by malicious people to cause a DoS (Denial of Service).

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Successful exploitation crashes the browser. Execution of arbitrary code has not been proven, but can't be completely ruled out.

The weakness has been confirmed in version 1.5.0.6 for Windows. Other versions may also be affected.

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Solution:
Do not visit untrusted web sites.