Mozilla · Firefox Esr · CVE-2016-5257
**Name of the Vulnerable Software and Affected Versions**
Mozilla Firefox versions prior to 49.0
Mozilla Firefox ESR 45.x versions prior to 45.4
Thunderbird versions prior to 45.4
**Description**
The issue affects the browser engine, allowing remote attackers to cause a denial of service, which may result in memory corruption and application crash, or possibly execute arbitrary code via unknown vectors.
**Recommendations**
For Mozilla Firefox versions prior to 49.0, update to version 49.0 or later.
For Mozilla Firefox ESR 45.x versions prior to 45.4, update to version 45.4 or later.
For Thunderbird versions prior to 45.4, update to version 45.4 or later.