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CVE-2020-12406 Mozilla Developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash

Description

Mozilla Developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.

Affected products and versions

Product Affected versions Fixed in
Thunderbird 68.9 earliest → < 68.9.0 68.9.0
Firefox 77 earliest → < 77 77
Firefox ESR 68.9 earliest → < 68.9 68.9
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