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.
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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Affected Vendors & Products
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Solution
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References
History
Wed, 05 Nov 2025 20:15:00 +0000
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ssvc
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Wed, 05 Nov 2025 16:45:00 +0000
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| 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 |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: cisco
Published:
Updated: 2025-11-05T20:07:12.870Z
Reserved: 2024-10-10T19:15:13.256Z
Link: CVE-2025-20343
Updated: 2025-11-05T20:06:57.551Z
Status : Received
Published: 2025-11-05T17:15:37.443
Modified: 2025-11-05T17:15:37.443
Link: CVE-2025-20343
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OpenCVE Enrichment
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