Cisco ISE RADIUS flaw lets unauthenticated attackers crash nodes
Cisco disclosed a high-severity vulnerability in Identity Services Engine's RADIUS feature, CVE-2026-20352. Improper handling of certain RADIUS requests lets an unauthenticated remote attacker send a crafted request and make an ISE node unavailable. Cisco released software updates; no workarounds exist. In single-node deployments, unauthenticated endpoints lose network access until the node recovers.
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