Cisco has released security updates for its products.
National CERT encourages users to apply available updates in order to prevent any kind of misuse by the attacker.

Тhe most important is CVE-2023-20198 vulnerability. This vulnerability in the web services interface of Cisco Firepower Management Center (FMC) Software could allow an authenticated, remote attacker to execute certain unauthorized configuration commands on a Firepower Threat Defense (FTD) device that is managed by the FMC Software.

For more details please visit: Cisco Security Advisory, and for CVE-2023-20048 vulnerability follow the link.