CVE-2026-20306

Summary

A vulnerability in the REST API of Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. To exploit this vulnerability, the attacker must have valid administrative credentials.

This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending crafted commands to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. In single-node deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a DoS condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.

Affected Software

VendorProductVersion RangeStatus
CiscoCisco Identity Services Engine Software3.4 Patch 4affected
CiscoCisco Identity Services Engine Software3.4 Patch 5affected
CiscoCisco Identity Services Engine Software3.5 Patch 3affected
CiscoCisco Identity Services Engine Software3.4 Patch 6affected
CiscoCisco ISE Passive Identity Connector3.4.0affected

Weaknesses

  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

ADP Enrichment

CISA ADP Vulnrichment

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

References