CVE-2025-20343
Cisco Identity Services Engine Radius Suppression Denial of Service Vulnerability
Severity
High 8.6
CVSS 3.1
Exploited
Not listed
EPSS
0.007
49.1th percentile
Discovered by
Third party
Published by the vendor
Published
Nov 5, 2025
Assigned by cisco
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) | Identity / IAM / MFA | cna-assigner |
Vendor-reported affected versions (1)
- Cisco · Cisco Identity Services Engine Software