CVE-2021-1392: Cisco IOS

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability in the CLI command permissions of Cisco IOS and Cisco IOS XE Software could allow an authenticated, local attacker to retrieve the password for Common Industrial Protocol (CIP) and then remotely configure the device as an administrative user. This vulnerability exists because incorrect permissions are associated with the show cip security CLI command. An attacker could exploit this vulnerability by issuing the command to retrieve the password for CIP on an affected device. A successful exploit could allow the attacker to reconfigure the device.

Affected products

• Cisco IOS: version 15.0(1)ey only; version 15.0(1)ey1 only; version 15.0(1)ey2 only; version 15.1(3)svs only; version 15.1(3)svt1 only; version 15.2(1)ey 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 3.7.4e only; version 3.7.5e only; …

Published 2021-03-24. Last modified 2026-06-17.