CVE-2020-3353: Cisco Identity Services Engine

Medium severity, CVSS 5.9. EPSS: 0.8% chance of exploitation in the next 30 days.

A vulnerability in the syslog processing engine of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a race condition that may occur when syslog messages are processed. An attacker could exploit this vulnerability by sending a high rate of syslog messages to an affected device. A successful exploit could allow the attacker to cause the Application Server process to crash, resulting in a DoS condition.

Affected products

• Cisco Identity Services Engine: version 2.2.0.470 only; version 2.3.0.298 only; version 2.4.0.357 only

Published 2020-06-03. Last modified 2026-06-17.