Detections
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Cisco IOS XE Software Bootstrap Arbitrary File Write (cisco-sa-bootstrap-KfgxYgdh)

medium Nessus Plugin ID 235488

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco IOS-XE Software is affected by a vulnerability.

 - A vulnerability in the bootstrap loading of Cisco IOS XE Software could allow an authenticated, local attacker to write arbitrary files to an affected system. This vulnerability is due to insufficient input validation of the bootstrap file that is read by the system software when a device is first deployed in SD-WAN mode or when an administrator configures SD-Routing on the device. An attacker could exploit this vulnerability by modifying a bootstrap file generated by Cisco Catalyst SD-WAN Manager, loading it into the device flash, and then either reloading the device in a green field deployment in SD-WAN mode or configuring the device with SD-Routing. A successful exploit could allow the attacker to perform arbitrary file writes to the underlying operating system. (CVE-2025-20155)

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

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwj60286

See Also

http://www.nessus.org/u?dd848aa4

http://www.nessus.org/u?564dd2a1

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwj60286

Plugin Details

Severity: Medium

ID: 235488

File Name: cisco-sa-bootstrap-KfgxYgdh-iosxe.nasl

Version: 1.2

Type: combined

Family: CISCO

Published: 5/7/2025

Updated: 5/9/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 4.4

Vector: CVSS2#AV:L/AC:L/Au:M/C:C/I:C/A:N

CVSS Score Source: CVE-2025-20155

CVSS v3

Risk Factor: Medium

Base Score: 6

Temporal Score: 5.2

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xe

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/7/2025

Vulnerability Publication Date: 5/7/2025

Reference Information

CVE: CVE-2025-20155

CWE: 1287

CISCO-SA: cisco-sa-bootstrap-KfgxYgdh

IAVA: 2025-A-0318

CISCO-BUG-ID: CSCwj60286