Vulnerability identifier: #VU51781

Vulnerability risk: Low

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-1435

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco IOS XE
Operating systems & Components / Operating system
Cisco 2600 Series Multiservice Platforms
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 3850 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 3650 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9300 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9500 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9200 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XE: Gibraltar 16.11.1

Cisco 2600 Series Multiservice Platforms: All versions

Cisco Catalyst 3850 Series Switches: All versions

Cisco Catalyst 3650 Series Switches: All versions

Cisco Catalyst 9300 Series Switches: All versions

Cisco Catalyst 9500 Series Switches: All versions

Cisco Catalyst 9200 Series Switches: All versions

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webcmdinjsh-UFJxTgZD

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.