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Arbitrary File Write Vulnerability in Cisco Catalyst SD-WAN Manager

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: MEDIUM

Software Affected

Cisco Catalyst SD-WAN release prior to 20.9.9.2

Cisco Catalyst SD-WAN release prior to 20.12.7.2

Cisco Catalyst SD-WAN release prior to 20.15.4.5

Cisco Catalyst SD-WAN release prior to 20.15.5.3

Cisco Catalyst SD-WAN release prior to 20.18.3.1

Cisco Catalyst SD-WAN release prior to 26.1.1.2

Overview

A vulnerability has been reported in Cisco Catalyst SD-WAN Manager, which may allow an authenticated remote attacker to create or overwrite arbitrary files on the affected system.

Target Audience:

All end-user organizations and individuals using Cisco Catalyst SD-WAN Manager.

Risk Assessment:

Risk of unauthorized file creation or modification and disruption of services.

Impact Assessment:

Potential for privilege escalation and compromise of system integrity.

Description

Cisco Catalyst SD-WAN Manager (formerly Cisco SD-WAN vManage) is a centralized network management platform used to provision, monitor, and manage Cisco SD-WAN deployments.

A vulnerability exists in the web-based management interface of Cisco Catalyst SD-WAN Manager due to improper validation of user-supplied input. An authenticated remote attacker could exploit this vulnerability by sending crafted HTTP requests to an affected API endpoint of the affected system.

Successful exploitation of this vulnerability could allow authenticated remote attacker to create or overwrite arbitrary files on the underlying file system of the affected device, resulting in privilege escalation including root.

Solution

Apply appropriate security updates and mitigations as mentioned in the vendor advisory:

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfw-c2rZvQ

Vendor Information

Cisco

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfw-c2rZvQ

References

 

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfw-c2rZvQ

CVE Name

CVE-2026-20262

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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