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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0318
Arbitrary File Write Vulnerability in Cisco Catalyst SD-WAN Manager

Original Issue Date:June 17, 2026

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

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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