A specially crafted web-page can cause the iertutil.dll module of Microsoft Internet Explorer 11 to free some memory while it still holds a reference to this memory. The module can be made to use this reference after the memory has been freed. Unlike many use-after-free bugs in MSIE, this issue, and apparently all code in this module, is not mitigated by MemGC. This issue appears to have been addressed in July 2016, as it failed to reproduce after the July security updates were installed.
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