CVE-2025-20343
Cisco Identity Services Engine Radius Suppression Denial of Service Vulnerability
Description
A vulnerability in the RADIUS setting Reject RADIUS requests from clients with repeated failures on Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause Cisco ISE to restart unexpectedly. This vulnerability is due to a logic error when processing a RADIUS access request for a MAC address that is already a rejected endpoint. An attacker could exploit this vulnerability by sending a specific sequence of multiple crafted RADIUS access request messages to Cisco ISE. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when Cisco ISE restarts.
Weakness: CWE-697
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Identity Services Engine (ISE) Check your version | Identity / IAM / MFA | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Identity Services Engine Software
Vendor advisory
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Cisco Identity Services Engine RADIUS Suppression Denial of Service Vulnerability
Cisco’s rating: High (advisory CVSS 8.6) · Published Nov 5, 2025
Bug ID: CSCwq27605
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from