Vulnerability identifier: #VU51709

Vulnerability risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1452

CWE-ID: CWE-78

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Cisco Embedded Services 3300 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco IOS XE
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists in ROM Monitor (ROMMON) due to incorrect validations of specific function arguments passed to a boot script when specific ROMMON variables are set.An attacker with physical access to the system can execute unsigned code at system boot time.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Embedded Services 3300 Series Switches: All versions

Cisco IOS XE: 17.2.1

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-romvar-cmd-inj-N56fYbrw
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu65039

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Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.