2021-29972 | Mozilla Firefox Cairo Library use after free

By Max On Jul 16, 2021

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6.0	$5k-$25k	0.80

A vulnerability was found in Mozilla Firefox up to 89.x (Web Browser) and classified as critical. This issue affects an unknown part of the component Cairo Library. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-416. Impacted is confidentiality, integrity, and availability.

The weakness was published 07/13/2021. It is possible to read the advisory at mozilla.org. The identification of this vulnerability is CVE-2021-29972 since 04/01/2021. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/16/2021).

Upgrading to version 90.0 eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.

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