Cisco released patches for a dozen high- and medium-severity vulnerabilities in IOS and IOS XE. Four defects (CVE-2026-20110, -20112, -20113, -20114) affecting Catalyst 9300 switches were publicly disclosed; two can be chained to escalate privileges and cause a persistent denial-of-service that required physical intervention in validated scenarios.
Part of the PlainSec briefing for 2026-03-26