CVE-2017-5440

Name of the Vulnerable Software and Affected Versions Thunderbird versions prior to 52.1 Firefox ESR versions prior to 52.1 Firefox ESR versions prior to 45.9 Firefox versions prior to 53

Description A use-after-free issue occurs during XSLT processing due to a failure to propagate error conditions, leading to objects being used after they no longer exist, resulting in a potentially exploitable crash. The vulnerability is related to the txExecutionState function and is associated with the use of memory after it has been freed during the processing of XSLT documents. This can allow a remote attacker to cause a denial of service.

Recommendations For Thunderbird versions prior to 52.1, update to version 52.1 or later. For Firefox ESR versions prior to 52.1, update to version 52.1 or later. For Firefox ESR versions prior to 45.9, update to version 45.9 or later. For Firefox versions prior to 53, update to version 53 or later.