USN-4565-1: OpenConnect vulnerability

05 October 2020

OpenConnect could be made to crash if it received specially crafted input.



  • openconnect - An SSL VPN client


It was discovered that OpenConnect has a buffer overflow when a malicious
server uses HTTP chunked encoding with crafted chunk sizes. An attacker
could use it to provoke a denial of service (crash).

Update instructions

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

Ubuntu 18.04

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