Cisco warns of unpatched SD-WAN zero-day exploited in attacks

On Thursday, Cisco warned of a high-severity, unpatched zero-day in the Cisco Catalyst SD-WAN Manager (tracked as CVE-2026-20245) actively exploited in attacks enabling root privilege escalation. The zero-day flaw impacts all deployment types, including On-Prem Deployment, Cisco SD-WAN Cloud-Pro, Cisco SD-WAN Cloud (Cisco Managed), and Cisco SD-WAN for Government (FedRAMP). In a Thursday advisory, Cisco said the issue stems from insufficient validation of user-supplied input, and it can allow local attackers with low privileges to execute arbitrary commands as root. "An attacker could exploit this vulnerability by uploading a crafted file to the affected system. A successful exploit could allow the attacker to perform command injection attacks on an affected system and elevate their privileges as the root user," the company explained. "To exploit this vulnerability, the attacker must have netadmin privileges on the affected system. This would require valid credentials or exploitation of CVE-2026-20182 or CVE-2026-20127. Cisco is not aware of successful exploitation by other methods," it added. "Cisco is not aware of successful exploitation by other methods. Cisco has observed limited cases where the exploitation of this bug resulted in a configuration change pushed to edge devices." Formerly known as SD-WAN vManage, this network management software helps admins monitor and manage up to 6,000 Catalyst SD-WAN devices from a single dashboard. Cisco's Product Security Incident R...