USN-4638-1: c-ares vulnerability

19 November 2020

c-ares could be made to denial of service if it received a specially crafted DNS request.



  • c-ares - library for asynchronous name resolution


It was discovered that c-ares incorrectly handled certain DNS requests.
An attacker could possibly use this issue to cause a denial of service.

Update instructions

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

Ubuntu 20.10

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