Critical Cisco ISE Flaw Enables Remote Denial-of-Service Attacks

Critical Cisco ISE Flaw Enables Remote Denial-of-Service Attacks

First seen 11 Nov 2025, 11:18 UTC •Scworld •90% similarity •47.6

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A critical vulnerability in Cisco's Identity Services Engine (ISE), tracked as CVE-2024-20399, allows unauthenticated remote attackers to trigger system restarts, leading to denial-of-service conditions. The flaw affects ISE versions 3.4.0 through 3.4 Patch 3 and can be exploited by sending specially crafted RADIUS requests to rejected endpoints, causing unexpected system crashes.

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Cisco Identity Services Engine (ISE)