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CVE-2025-20343

7.5 high exploit SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Public exploits 1

Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.5 · ciscoNVD modified 2026-10-18 21:10

Affected (CPE criteria) 4

  • 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:*:*:*:*:*:*

References 1