CVE-2026-20307

published 2026-09-16

CVE-2026-20307: A vulnerability in the web-based management interface of Cisco ISE could allow an authenticated, remote attacker to execute arbitrary commands on the…

Priority P2 72 critical 9.9 CVSS 3.1

AV N AC L PR L UI N S C C H I H A H

A vulnerability in the web-based management interface of Cisco ISE could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. To exploit this vulnerability, the attacker must have at least low-privileged administrative credentials.

This vulnerability is due to insecure deserialization of a user-supplied Java byte stream. An attacker could exploit this vulnerability by sending a crafted serialized Java object 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 denial of service (DoS) condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.

Affected

47 ranges · showing 25

Vendor	Product	Version range	Fixed in
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—
cisco	cisco_identity_services_engine_software	—	—

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