cisco-sa-ise-RADIUS-dos-wR3hYPMwHighCVSS 8.6

Cisco Identity Services Engine RADIUS Denial of Service Vulnerability

Published
September 16, 2026
Last Modified
September 16, 2026

🔗 CVE IDs covered (1)

CVE-2026-20352 →

📋 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.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

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 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-jfxK98ZP"]. In addition, for further documentation of improvements and fixes in Cisco Identity Services Engine, see Cisco Identity Services Engine Security Hardening Release: September 2026 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-ise-XU5EwX5T"].

CVE-2026-20352 — Cisco Identity Services Engine RADIUS Denial of Service Vulnerability (CVSS 3.1 8.6, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)

🎯 Affected products35

  • Cisco Identity Services Engine Software
  • Cisco Identity Services Engine Software 3.2 Patch 10
  • Cisco Identity Services Engine Software 3.2 Patch 8
  • Cisco Identity Services Engine Software 3.2 Patch 9
  • Cisco Identity Services Engine Software 3.2.0
  • Cisco Identity Services Engine Software 3.2.0 p1
  • Cisco Identity Services Engine Software 3.2.0 p2
  • Cisco Identity Services Engine Software 3.2.0 p3
  • Cisco Identity Services Engine Software 3.2.0 p4
  • Cisco Identity Services Engine Software 3.2.0 p5
  • Cisco Identity Services Engine Software 3.2.0 p6
  • Cisco Identity Services Engine Software 3.2.0 p7
  • Cisco Identity Services Engine Software 3.3 Patch 1
  • Cisco Identity Services Engine Software 3.3 Patch 10
  • Cisco Identity Services Engine Software 3.3 Patch 11
  • Cisco Identity Services Engine Software 3.3 Patch 2
  • Cisco Identity Services Engine Software 3.3 Patch 3
  • Cisco Identity Services Engine Software 3.3 Patch 4
  • Cisco Identity Services Engine Software 3.3 Patch 5
  • Cisco Identity Services Engine Software 3.3 Patch 6
  • Cisco Identity Services Engine Software 3.3 Patch 7
  • Cisco Identity Services Engine Software 3.3 Patch 8
  • Cisco Identity Services Engine Software 3.3 Patch 9
  • Cisco Identity Services Engine Software 3.3.0
  • Cisco Identity Services Engine Software 3.4 Patch 1
  • Cisco Identity Services Engine Software 3.4 Patch 2
  • Cisco Identity Services Engine Software 3.4 Patch 3
  • Cisco Identity Services Engine Software 3.4 Patch 4
  • Cisco Identity Services Engine Software 3.4 Patch 5
  • Cisco Identity Services Engine Software 3.4 Patch 6
  • +5 more not shown

✅ Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com Workarounds: There are no workarounds that address this vulnerability.

🔗 References (5)