Cisco today released patches for two products, including one for a vulnerability rated a high criticality in Cisco IOS XR for the Cisco Network Convergence System series routers. The flaw rests in the management of system timer resources and could allow an attacker to remotely crash the router. Cisco s second patch released today addresses a flaw in the Cisco ASR 5000 Series, prior to versions 19.4 and 20.1. Cisco said the flaw is in the SNMP configuration management and a remote attacker can exploit this.
Source: https://threatpost.com/cisco-patches-dos-flaw-in-ncs-6000-routers/119296/