CVE-2026-20352

Summary

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.

Affected Software

VendorProductVersion RangeStatus
CiscoCisco Identity Services Engine Software3.2.0affected
CiscoCisco Identity Services Engine Software3.2.0 p1affected
CiscoCisco Identity Services Engine Software3.2.0 p2affected
CiscoCisco Identity Services Engine Software3.3.0affected
CiscoCisco Identity Services Engine Software3.2.0 p3affected
CiscoCisco Identity Services Engine Software3.2.0 p4affected
CiscoCisco Identity Services Engine Software3.2.0 p5affected
CiscoCisco Identity Services Engine Software3.2.0 p6affected
CiscoCisco Identity Services Engine Software3.3 Patch 2affected
CiscoCisco Identity Services Engine Software3.3 Patch 1affected
CiscoCisco Identity Services Engine Software3.3 Patch 3affected
CiscoCisco Identity Services Engine Software3.4.0affected
CiscoCisco Identity Services Engine Software3.2.0 p7affected
CiscoCisco Identity Services Engine Software3.3 Patch 4affected
CiscoCisco Identity Services Engine Software3.4 Patch 1affected
CiscoCisco Identity Services Engine Software3.3 Patch 5affected
CiscoCisco Identity Services Engine Software3.3 Patch 6affected
CiscoCisco Identity Services Engine Software3.4 Patch 2affected
CiscoCisco Identity Services Engine Software3.3 Patch 7affected
CiscoCisco Identity Services Engine Software3.4 Patch 3affected
CiscoCisco Identity Services Engine Software3.5.0affected
CiscoCisco Identity Services Engine Software3.4 Patch 4affected
CiscoCisco Identity Services Engine Software3.3 Patch 8affected
CiscoCisco Identity Services Engine Software3.2 Patch 8affected
CiscoCisco Identity Services Engine Software3.5 Patch 1affected
CiscoCisco Identity Services Engine Software3.3 Patch 9affected
CiscoCisco Identity Services Engine Software3.2 Patch 9affected
CiscoCisco Identity Services Engine Software3.4 Patch 5affected
CiscoCisco Identity Services Engine Software3.5 Patch 3affected
CiscoCisco Identity Services Engine Software3.5 Patch 2affected
CiscoCisco Identity Services Engine Software3.3 Patch 10affected
CiscoCisco Identity Services Engine Software3.3 Patch 11affected
CiscoCisco Identity Services Engine Software3.4 Patch 6affected
CiscoCisco Identity Services Engine Software3.2 Patch 10affected

Weaknesses

  • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

References