CVE-2026-20352
Cisco Identity Services Engine RADIUS Denial of Service Vulnerability
Description
A vulnerability in the RADIUS 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 crafted RADIUS request directly to an affected device. A successful exploit could allow the attacker to cause the ISE node to become unavailable. For single node deployments in that condition, endpoints that have not already authenticated would be unable to access the network until the node comes back up on its own.
Weakness: CWE-119
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
cisco-sa-ise-RADIUS-dos-wR3hYPMw
Cisco Identity Services Engine RADIUS Denial of Service Vulnerability
Cisco’s rating: High (advisory CVSS 8.6) · Published Sep 16, 2026
Bug ID: CSCwv82115
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from