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CVE-2025-20343

Cisco Identity Services Engine Radius Suppression Denial of Service Vulnerability

Published: Nov 5, 2025Updated: Nov 19, 2025 Sources: CVE List NVD BDUCWE-697
NVD MITRE
8.6CVSSHIGH
EPSS Score
0.7%
Top 53.4%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-697

Affected Products

Cisco Identity Services Engine SoftwareCisco
On-premSecurity Product
Networking Infrastructure
identity services enginecisco
On-premNetwork Device
Networking Infrastructure
Cisco Identity Services EngineCisco Systems Inc.
On-premSecurity Product
Networking Infrastructure
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.
cisco systems inc.commercialUSNetworking Infrastructureaka cisco systems, cisco

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-radsupress-dos-8YF3JThh
sec.cloudapps.cisco.com
https://github.com/B1ack4sh/Blackash-CVE-2025-20343
github.com

Timeline

Published
Nov 5, 2025
Last Updated
Nov 19, 2025

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