Cisco releases security updates for the Cisco IOS XR Software Cisco Discovery Protocol Format String Vulnerability, which is deployed on several Cisco router platforms including NCS 540 & 560, NCS 5500, 8000, and ASR 9000 series routers.
National CERT encourages users to apply all available updates in order to prevent any kind of misuse by the attacker.
For more details please visit: Cisco Security Advisory