CVE-2021-40121: Cisco Identity Services Engine

Medium severity, CVSS 4.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) Software could allow an attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. For more information about these vulnerabilities, see the Details section of this advisory.

Affected products

• Cisco Identity Services Engine: up to and including 2.6; version 2.6(0.156) only; version 2.6(0.999) only; version 2.6.0 only; version 2.7 only; version 2.7(0.207) only; …

Published 2021-10-21. Last modified 2026-06-17.