CVE-2025-20152: Cisco Identity Services Engine

High severity, CVSS 8.6. EPSS: 0.7% chance of exploitation in the next 30 days.

A vulnerability in the RADIUS message processing feature of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain RADIUS requests. An attacker could exploit this vulnerability by sending a specific authentication request to a network access device (NAD) that uses Cisco ISE for authentication, authorization, and accounting (AAA). A successful exploit could allow the attacker to cause Cisco ISE to reload.

Affected products

• Cisco Identity Services Engine: version 3.4.0 only

Published 2025-05-21. Last modified 2026-06-17.