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CVE-2020-15669 When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified

Description

When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified. This results in a use-after-free and we presume that with enough effort it could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.12 and Thunderbird < 68.12.

Affected products and versions

Product Affected versions Fixed in
Firefox ESR 68.12 earliest → < 68.12 68.12
Thunderbird 68.12 earliest → < 68.12 68.12
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