API Vulnerability in Cisco Catalyst SD-WAN Manager Allows File Overwrite

CVE-2026-20122

What is CVE-2026-20122?

CVE-2026-20122 is a critical vulnerability found in Cisco's Catalyst SD-WAN Manager, a robust system designed for managing and optimizing Software-Defined Wide Area Networks (SD-WAN). This vulnerability arises from improper file handling in the API of the SD-WAN Manager. It enables authenticated remote attackers, who possess valid read-only credentials, to overwrite arbitrary files on the local file system. This exploit can lead to a significant breach in security, as attackers can gain unauthorized permissions, potentially increasing their control over the system. Given that Cisco Catalyst SD-WAN is widely employed for managing network infrastructure within organizations, the implications of this vulnerability could lead to severe operational disruptions.

Potential impact of CVE-2026-20122

1. Unauthorized Access: The ability for an attacker to overwrite files can result in the elevation of privileges. This means they could gain access to sensitive information or administrative functionalities within the SD-WAN infrastructure.

2. Service Disruption: Exploiting this vulnerability could lead to corrupted or lost configuration files, affecting the operation of critical network functions. Such disruptions can ripple through an organization's operations, resulting in downtime and loss of services.

3. Data Integrity Risks: An attacker could potentially manipulate the configuration or operational files, leading to unauthorized changes in network settings. This could compromise the integrity of the network management system, causing misconfigurations that expose the organization to further vulnerabilities or security breaches.

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