SNMP RW Community Abuse on IOS XE: snmpset, Then SNMPv3 Fix
Built in my home lab on IOS XE 17.18: a sniffed SNMPv2c RW community renamed the router and shut OSPF. SNMPv3 authPriv with an ACL stopped it.
SNMP
The monitoring protocol every NMS still speaks. Articles tagged SNMP cover community strings versus SNMPv3, MIBs and OIDs, traps versus polling, and locking the agent down properly.