Cisco's recent security alert regarding the CVE-2026-20245 vulnerability in the Catalyst SD-WAN Manager has brought to light yet another critical flaw in their network infrastructure products. This high-severity issue, which carries a CVSS score of 7.8, is actively being exploited, posing a significant risk to organizations using affected deployment types such as On-Prem Deployment, Cisco SD-WAN Cloud-Pro, Cisco SD-WAN Cloud (Cisco Managed), and Cisco SD-WAN for Government (FedRAMP).
What makes this particular vulnerability particularly concerning is the ease with which it can be exploited. An authenticated, local attacker can execute arbitrary commands as root by supplying a crafted file to the affected system. This is due to insufficient validation of user-supplied input, which allows for command injection attacks and privilege escalation. The fact that the attacker must have netadmin privileges, which can be obtained through the exploitation of other vulnerabilities like CVE-2026-20182 or CVE-2026-20127, makes the attack surface even wider.
The impact of this vulnerability is not just theoretical. Cisco has observed limited cases where the exploitation of CVE-2026-20245 resulted in configuration changes being pushed to edge devices. This means that attackers could potentially alter network configurations, leading to service disruptions or even complete network takeovers. The fact that there are currently no patches or mitigations available for this vulnerability makes the situation even more dire.
What makes this situation even more alarming is the context in which it has emerged. CVE-2026-20245 is the seventh flaw impacting Cisco SD-WAN to be flagged as actively exploited this year alone. This trend is concerning, as it suggests that attackers are increasingly targeting Cisco's network infrastructure products. The fact that Cisco has addressed other high-severity vulnerabilities in the past, such as CVE-2026-20230 in Unified Communications Manager, only highlights the need for organizations to stay vigilant and proactive in their security posture.
In my opinion, the fact that Cisco has not yet released patches or mitigations for CVE-2026-20245 is a significant oversight. Given the severity of the vulnerability and the fact that it is actively being exploited, organizations should be urged to take immediate action. Upgrading their SD-WAN software to ensure they have applied the fixes released for CVE-2026-20182 is a crucial step, but it is not enough. Cisco should be working closely with its customers to develop and release patches for CVE-2026-20245 as soon as possible.
In the meantime, organizations should be on high alert for any signs of compromise. Checking the "/var/log/scripts.log" file for indicators of compromise (IoCs) such as the ones listed in Cisco's advisory is a good starting point. However, organizations should also be prepared to take more aggressive measures, such as isolating affected systems and conducting thorough security audits, to mitigate the risk of further exploitation.
In conclusion, the CVE-2026-20245 vulnerability in the Cisco Catalyst SD-WAN Manager is a serious threat that organizations cannot afford to ignore. The fact that it is actively being exploited and that there are currently no patches or mitigations available makes it a high-priority issue. Cisco should be working closely with its customers to develop and release patches as soon as possible, and organizations should be taking proactive steps to protect their networks from this and other emerging threats.
