Cisco Identity Services Engine RADIUS Denial of Service Vulnerability (CVE-2025-20152)

CVE number = CVE-2025-20152

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.

This vulnerability affects Cisco ISE if it is configured with RADIUS authentication services.

Note: RADIUS services are enabled by default.

If Cisco ISE is being used for TACACS+ only, the network device is not affected by this vulnerability.

Cisco has released software updates that address this vulnerability.

There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-restart-ss-uf986G2Q