Cisco Security Advisoriescisco-sa-ise-RADIUS-dos-wR3hYPMw

Cisco Identity Services Engine RADIUS Denial of Service Vulnerability

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. 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-RADIUS-dos-wR3hYPMw This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of September 16, 2026, Security Advisories. In addition, for further documentation of improvements and fixes in Cisco Identity Services Engine, see Cisco Identity Services Engine Security Hardening Release: September 2026. Security Impact Rating: High CVE: CVE-2026-20352

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HighCVSS not listedHigh severity

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Sep 16, 2026 at 4:00 PM UTC
Published by Cisco
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Sep 16, 2026 at 4:10 PM UTC
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Sep 26, 2026 at 6:40 PM UTC
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CVE-2026-20352View CVSS, KEV, EPSS, and threat context

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Vendor: Cisco
Advisory ID: cisco-sa-ise-RADIUS-dos-wR3hYPMw
Last source check: Sep 26, 2026 at 6:40 PM UTC

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Related advisories from Cisco

Cisco Advance Notification for Publication of September 16, 2026, Security Advisories

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