Cisco Identity Services Engine RADIUS Denial of Service Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-20352
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 21:17:12 UTC
Updated2026-09-18 13:28:28 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS: 0.004040000 probability, percentile 0.344190000 (date 2026-09-20)

Problem Types: CWE-119 | CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.1CNACVSSV3_18.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cisco Cisco Identity Services Engine Software affected 3.2.0 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.2.0 p1 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.2.0 p2 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3.0 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.2.0 p3 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.2.0 p4 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.2.0 p5 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.2.0 p6 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 2 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 1 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 3 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.4.0 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.2.0 p7 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 4 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.4 Patch 1 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 5 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 6 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.4 Patch 2 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 7 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.4 Patch 3 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.5.0 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.4 Patch 4 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 8 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.2 Patch 8 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.5 Patch 1 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 9 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.2 Patch 9 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.4 Patch 5 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.5 Patch 3 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.5 Patch 2 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 10 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.3 Patch 11 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.4 Patch 6 Not specified
CNA Cisco Cisco Identity Services Engine Software affected 3.2 Patch 10 Not specified

References

ReferenceSourceLinkTags
sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-RA... [email protected] sec.cloudapps.cisco.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Exploits

CNA: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

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