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CVE-2025-20343

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CVE-2025-20343

Published: Nov 5, 2025

Modified: Nov 5, 2025

PUBLISHED

CVSS v3.1

8.6

HIGH

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.

VendorProductVersions

Cisco

Cisco Identity Services Engine Software

affected
3.4.0
affected
3.4 Patch 1
affected
3.4 Patch 2
affected
3.4 Patch 3

Weaknesses (CWE)

CWE-697

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

References

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