CISA description
A vulnerability in the Virtual Private LAN Service (VPLS) code of Cisco IOS for Cisco Catalyst 6800 Series Switches could allow an unauthenticated, adjacent attacker to cause a denial of service.
CVE-2017-12238
Cisco · Catalyst 6800 Series Switches
Cisco Catalyst 6800 Series Switches VPLS Denial-of-Service Vulnerability
Required action
Apply updates per vendor instructions.
Notes & references
Where this lands in 800-53
Vulnerability data triggers these controls during assessment and continuous monitoring.