Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2025-20343

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
05/11/2025
Last modified:
19/11/2025

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.<br /> <br /> 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.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.60 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
8.60
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:cisco:identity_services_engine:3.4.0:-:*:*:*:*:*:*
cpe:2.3:a:cisco:identity_services_engine:3.4.0:patch1:*:*:*:*:*:*
cpe:2.3:a:cisco:identity_services_engine:3.4.0:patch2:*:*:*:*:*:*
cpe:2.3:a:cisco:identity_services_engine:3.4.0:patch3:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools