CVE-2025-20343

Summary

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.

Affected Software

VendorProductVersion RangeStatus
CiscoCisco Identity Services Engine Software3.4.0affected
CiscoCisco Identity Services Engine Software3.4 Patch 1affected
CiscoCisco Identity Services Engine Software3.4 Patch 2affected
CiscoCisco Identity Services Engine Software3.4 Patch 3affected

Weaknesses

  • CWE-697: Incorrect Comparison

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References