Use-after-free vulnerability in addRange method in Firefox and Thunderbird

CVE-2017-5403 · HIGH Severity

AV:N/AC:L/AU:N/C:P/I:P/A:P

When adding a range to an object in the DOM, it is possible to use "addRange" to add the range to an incorrect root object. This triggers a use-after-free, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 52 and Thunderbird < 52.

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