CVE-2021-34759: Cisco Identity Services Engine

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

A vulnerability in the web-based management interface of Cisco Identity Services Engine (ISE) Software could allow an authenticated, remote attacker with administrative credentials to conduct a cross-site scripting (XSS) attack against a user of the interface. This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability 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 interface or access sensitive, browser-based information. To exploit this vulnerability, an attacker would need valid administrative credentials.

Affected products

• Cisco Identity Services Engine: before 2.2.0 (fixed in 2.2.0); version 2.2.0 only; version 2.3.0 only; version 2.4.0 only; version 2.6.0 only; version 2.7.0 only; …

Published 2021-09-02. Last modified 2026-06-17.