CVE-2020-3225: Cisco IOS

High severity, CVSS 8.6. EPSS: 2.1% chance of exploitation in the next 30 days.

Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to insufficient input processing of CIP traffic. An attacker could exploit these vulnerabilities by sending crafted CIP traffic to be processed by an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Affected products

• Cisco IOS: version 12.2(44)ex only; version 12.2(44)ex1 only; version 12.2(46)se1 only; version 12.2(46)se2 only; version 12.2(50)se only; version 12.2(50)se1 only; …
• Cisco IOS XE: version 3.3.0xo only; version 3.3.1xo only; version 3.3.2xo only; version 3.6.5be only; version 3.8.9e only; version 3.8.10e only; …

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