CVE-2021-1392: Cisco IOS and IOS XE Software Common Industrial Protocol Privilege Escalation Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-24 · updated 2026-06-17
Weakness: CWE-522

Description

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: 15.0(1)ey, 15.0(1)ey1, 15.0(1)ey2, 15.1(3)svs, 15.1(3)svt1, 15.2(1)ey (+179)
Cisco IOS XE: 3.3.0xo, 3.3.1xo, 3.3.2xo, 3.6.5be, 3.7.4e, 3.7.5e (+23)

References

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