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Mozilla Foundation Security Advisory 2013-46

Title: Use-after-free with video and onresize event
Impact: Critical
Announced: May 14, 2013
Reporter: Nils
Products: Firefox, Thunderbird

Fixed in: Firefox 21.0
  Firefox ESR 17.0.6
  Thunderbird 17.0.6
  Thunderbird ESR 17.0.6


Security researcher Nils reported a use-after-free when resizing video while playing. This could allow for arbitrary code execution.

In general these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled, but are potentially a risk in browser or browser-like contexts.