QSN-4215-1: nss vulnerability
December 9, 2019
NSS could be made to crash if it received a specially crafted certificate.
It was discovered that NSS incorrectly handled certain certificates. An attacker could possibly use this issue to cause a denial of service.
A general update will usually fix all issues, but to make sure, you can check your current version with:
If the current version you have is before 2:3.28.4-0ubuntu0.16.04.9, run the following:
$ sudo apt-get install libnss3