USN-4699-1: Apache Log4net vulnerability

19 January 2021

Apache Log4net could made to expose sensitive information if it received a specially crafted configuration file.



  • log4net - Highly configurable logging API for the CLI log4net


It was discovered that Apache Log4net incorrectly handled certain configuration files.
An attacker could possibly use this issue to expose sensitive information.

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

In general, a standard system update will make all the necessary changes.