OS Command Injection in Cisco Systems, Inc products - CVE-2021-1435

Vulnerability identifier: #VU51781

CSH Severity: Low

CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-1435

CWE-ID: CWE-78

Exploitation vector: Remote access

Exploit availability: The vulnerability is being exploited in the wild

The vulnerability allows a remote user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in the web UI. A remote administrator can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Cisco 2600 Series Multiservice Platforms
Cisco Catalyst 3850 Series Switches
Cisco Catalyst 3650 Series Switches
Cisco Catalyst 9300 Series Switches
Cisco Catalyst 9500 Series Switches
Cisco Catalyst 9200 Series Switches
Cisco IOS XE

Install updates from vendor's website.

Cisco IOS XE - addressed in versions 16.9.6.59, 16.9.7, 16.12.0.148, 16.12.1, 16.12.1c, 16.12.1d, 16.12.1e, 16.12.1s, 16.12.1t, 16.12.1w, 16.12.1x, 16.12.1y, 16.12.1z, 16.12.1a, 16.12.1b, 16.12.1.7, 16.12.2, 16.12.2s, 16.12.2t, 16.12.2a, 16.12.3, 16.12.3s, 16.12.3a, 16.12.4, 16.12.4a, 16.12.5, 16.12.5a, 17.1.0.59, 17.1.1, 17.1.1s, 17.1.1t, 17.1.1a, 17.1.2, 17.1.3, 17.2.1, 17.2.1v, 17.2.1a, 17.2.1r, 17.2.2, 17.3.1, 17.3.1w, 17.3.1x, 17.3.1a, 17.3.2, 17.3.2a, 17.3.3, 17.3.3a, 17.4.1, 17.4.1a, 17.4.1b

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webcmdinjsh-UFJxTgZD

• OS Command Injection in Cisco IOS XE Software