An issue was found in the IonMonkey JIT compiler of the Mozilla Firefox web browser which could lead to arbitrary code execution.

For Debian 8 Jessie, this problem has been fixed in version 68.4.1esr-1~deb8u1.

We recommend that you upgrade your firefox-esr packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS