isco has disclosed a high-severity security vulnerability affecting Cisco Catalyst SD-WAN Manager, formerly known as vManage. The flaw, identified as CVE-2026-20245, has a CVSS score of 7.8 and is already being exploited in real-world attacks. The vulnerability originates from improper input validation within the platform’s command-line interface, enabling authenticated attackers with network administrator privileges to execute arbitrary commands on affected systems. By uploading a specially crafted file, an attacker can exploit the weakness and gain root-level access to the underlying operating system. This level of access provides complete control over the device, allowing malicious actors to alter configurations, deploy additional payloads, or manipulate network operations. Cisco’s Product Security Incident Response Team (PSIRT) confirmed that attackers have used this flaw to make unauthorized changes to SD-WAN edge device configurations, suggesting attempts to maintain persistence and influence network traffic. Although successful exploitation requires authenticated access, threat actors may obtain the necessary privileges through compromised credentials or by combining this flaw with other vulnerabilities. This increases the overall risk for organizations relying on Cisco SD-WAN infrastructure for critical network management and connectivity. The vulnerability affects all Cisco Catalyst SD-WAN Manager deployments, including on-premises, cloud-hosted, Cisco-managed, and FedRAMP-authorized environments. Cisco has released indicators of compromise (IOCs) to assist organizations in detecting potential exploitation attempts. Security teams are advised to inspect system logs, particularly the scripts.log file located in the /var/log directory, for suspicious file upload activity or unusual command execution events. At the time of disclosure, Cisco had not provided a software fix or workaround. The company recommends collecting forensic data, preserving logs, reviewing device configurations for unauthorized modifications, and engaging Cisco Technical Assistance Center (TAC) if compromise is suspected. Organizations should also strengthen access controls and continuously monitor SD-WAN management systems to reduce the risk of further exploitation.
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