A vulnerability in the RADIUS setting Reject RADIUS requests from clients with repeated failures on Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause Cisco ISE to restart unexpectedly.

This vulnerability is due to a logic error when processing a RADIUS access request for a MAC address that is already a rejected endpoint. An attacker could exploit this vulnerability by sending a specific sequence of multiple crafted RADIUS access request messages to Cisco ISE. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when Cisco ISE restarts.
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Fixes

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Workaround

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History

Wed, 05 Nov 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 05 Nov 2025 16:45:00 +0000

Type Values Removed Values Added
Description A vulnerability in the RADIUS setting Reject RADIUS requests from clients with repeated failures on Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause Cisco ISE to restart unexpectedly. This vulnerability is due to a logic error when processing a RADIUS access request for a MAC address that is already a rejected endpoint. An attacker could exploit this vulnerability by sending a specific sequence of multiple crafted RADIUS access request messages to Cisco ISE. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when Cisco ISE restarts.
Title Cisco Identity Services Engine Radius Suppression Denial of Service Vulnerability
Weaknesses CWE-697
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2025-11-05T20:07:12.870Z

Reserved: 2024-10-10T19:15:13.256Z

Link: CVE-2025-20343

cve-icon Vulnrichment

Updated: 2025-11-05T20:06:57.551Z

cve-icon NVD

Status : Received

Published: 2025-11-05T17:15:37.443

Modified: 2025-11-05T17:15:37.443

Link: CVE-2025-20343

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.