DNS Client Bug Causes Cisco Switch Reboot Loops Globally

DNS Client Bug Causes Cisco Switch Reboot Loops Globally

First seen 9 Jan 2026, 10:47 UTC •BleepingcomputerThecyberexpress •39.7

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On January 8, 2026, a flaw in the DNS client service led to widespread reboot loops in multiple Cisco Small Business Switch models. The issue, which began around 2:00 AM, affected organizations of all sizes as the switches logged fatal DNS errors and rebooted repeatedly, with some devices experiencing complete core dumps.

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