CVE-2017-3820: A vulnerability in Simple Network Management Protocol (SNMP) functions of Cisco ASR 1000 Series Aggregation...

Security readout for executives and security teams

This issue affects certain Cisco ASR 1000 routers running specific IOS XE releases. An authenticated remote user can abuse SNMP handling to drive high CPU usage, potentially disrupting routing services. The business impact is availability loss on network infrastructure, not data theft based on the provided sources. Exposure is most likely where Cisco ASR 1000 routers run the affected IOS XE versions and SNMP is reachable by authenticated users. Risk depends on SNMP account control, management-plane filtering, and whether affected releases remain deployed. Treat this as a medium-priority infrastructure availability issue. It should be handled in normal network maintenance unless SNMP is broadly reachable or affected routers support critical business connectivity, in which case accelerate remediation. Mitigation focus: Inventory Cisco ASR 1000 devices and their IOS XE versions.; Upgrade affected devices to Cisco-listed fixed releases where operationally approved.; Restrict SNMP access to trusted management networks and authorized users..

Prepared

Jun 13, 2026, 06:20 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.