A vulnerability in the web user interface of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to insufficient resource handling by the affected software when the user interface is under a high load. To exploit this vulnerability, the attacker must have access to the management interface of the software, which is typically connected to a restricted management network. There are no workarounds that address this vulnerability; Cisco has released software updates that address it.”]
Source: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170322-webui