USN-4687-1: Firefox vulnerability

08 January 2021

Firefox could be made to crash or run programs as your login if it opened a malicious website.



  • firefox - Mozilla Open Source web browser


A use-after-free was discovered in Firefox when handling SCTP packets.
An attacker could potentially exploit this to cause a denial of service,
or execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

After a standard system update you need to restart Firefox to make
all the necessary changes.


Related notices