Cisco IOS XE Software ROM Monitor for Industrial Switches Command Injection (cisco-sa-iosxe-romvar-cmd-inj-N56fYbrw)

high Nessus Plugin ID 148427
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VPR Score: 5.9


The remote device is missing a vendor-supplied security patch


According to its self-reported version, IOS-XE is affected by a command injection vulnerability due to incorrect validations of specific function arguments passed to a boot script when specific ROMMON variables are set. An unauthenticated, physical attacker can exploit this by setting malicious values for a specific ROMMON variable, which can execute unsigned code and bypass the image verification check during the secure boot process of an affected device. To exploit this vulnerability, the attacker would need to have unauthenticated, physical access to the device or obtain privileged access to the root shell on the device.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvu65039

See Also

Plugin Details

Severity: High

ID: 148427

File Name: cisco-sa-iosxe-romvar-cmd-inj-N56fYbrw.nasl

Version: 1.4

Type: combined

Family: CISCO

Published: 4/12/2021

Updated: 4/13/2021

Dependencies: cisco_ios_xe_version.nasl

Risk Information

Risk Factor: High

VPR Score: 5.9

CVSS Score Source: CVE-2021-1452

CVSS v2.0

Base Score: 7.2

Temporal Score: 5.3

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xe

Required KB Items: Host/Cisco/IOS-XE/Version, Host/Cisco/IOS-XE/Model

Exploit Ease: No known exploits are available

Patch Publication Date: 3/24/2021

Vulnerability Publication Date: 3/24/2021

Reference Information

CVE: CVE-2021-1452

IAVA: 2021-A-0141


CISCO-SA: cisco-sa-iosxe-romvar-cmd-inj-N56fYbrw

CWE: 78