CVE-2021-1604: Cisco Identity Services Engine

Medium severity, CVSS 4.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user. These vulnerabilities exist because the web-based management interface does not sufficiently validate user-supplied input. An attacker could exploit these vulnerabilities by injecting malicious code into specific pages of the interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information. To exploit these vulnerabilities, the attacker would need valid administrative credentials.

Affected products

• Cisco Identity Services Engine: before 2.6.0 (fixed in 2.6.0); version 2.6(0.999) only; version 2.6.0 only; version 2.7(0.356) only; version 2.7.0 only; version 3.0.0 only

Published 2021-07-08. Last modified 2026-06-17.