Riskcovery

CVE-2026-20352

Cisco Identity Services Engine RADIUS Denial of Service Vulnerability

State
Published
Severity
8.6 High
Published
Sep 16, 2026
Updated
Sep 17, 2026
Reserved
Oct 8, 2025

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.18.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hcisco

Weaknesses

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

Affected Products

ProductVersions
Cisco Identity Services Engine SoftwareCisco
  • 3.2.0Affected
  • 3.2.0 p1Affected
  • 3.2.0 p2Affected
  • 3.3.0Affected
  • 3.2.0 p3Affected
  • 3.2.0 p4Affected
  • 3.2.0 p5Affected
  • 3.2.0 p6Affected
  • 3.3 Patch 2Affected
  • 3.3 Patch 1Affected
  • 3.3 Patch 3Affected
  • 3.4.0Affected
  • 3.2.0 p7Affected
  • 3.3 Patch 4Affected
  • 3.4 Patch 1Affected
  • 3.3 Patch 5Affected
  • 3.3 Patch 6Affected
  • 3.4 Patch 2Affected
  • 3.3 Patch 7Affected
  • 3.4 Patch 3Affected
  • 3.5.0Affected
  • 3.4 Patch 4Affected
  • 3.3 Patch 8Affected
  • 3.2 Patch 8Affected
  • 3.5 Patch 1Affected
  • and 9 more versions

References

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