What is the severity of CVE-2025-20155?

CVE-2025-20155 is classified as a high-severity vulnerability.

How do I fix CVE-2025-20155?

To fix CVE-2025-20155, upgrade to a patched version of the Cisco IOS XE Software that addresses the vulnerability.

What type of attack can be performed using CVE-2025-20155?

An authenticated, local attacker can exploit CVE-2025-20155 to write arbitrary files on the affected system.

Who is affected by CVE-2025-20155?

CVE-2025-20155 affects devices running vulnerable versions of Cisco IOS XE Software.

Vulnerability/
CVE-2025-20155

medium

CWE

1287 20

7/5/2025

8/5/2025

CVE-2025-20155: Input Validation

First published: Wed May 07 2025(Updated: )

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.

Credit: psirt@cisco.com

Affected Software	Affected Version	How to fix
Cisco IOS XE

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Reference Links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootstrap-KfgxYgdh

Frequently Asked Questions

What is the severity of CVE-2025-20155?
CVE-2025-20155 is classified as a high-severity vulnerability.
How do I fix CVE-2025-20155?
To fix CVE-2025-20155, upgrade to a patched version of the Cisco IOS XE Software that addresses the vulnerability.
What type of attack can be performed using CVE-2025-20155?
An authenticated, local attacker can exploit CVE-2025-20155 to write arbitrary files on the affected system.
Who is affected by CVE-2025-20155?
CVE-2025-20155 affects devices running vulnerable versions of Cisco IOS XE Software.
What is the cause of CVE-2025-20155?
CVE-2025-20155 is caused by insufficient input validation of the bootstrap file by the Cisco IOS XE Software.

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collector/nvd-api
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