CVE-2026-3356 Details

An authentication bypass vulnerability has been identified in the Anritsu Remote Spectrum Monitor model MS27102A. This flaw allows unauthorized users to access and manipulate the device's management interface. The vulnerability arises from the device's design, as it lacks any mechanism to enable or configure authentication, rather than being a result of deployment errors.

CISA recommends minimizing network exposure for all control system devices, ensuring they are not accessible from the Internet. It is advised to locate control system networks and remote devices behind firewalls and isolate them from business networks. When remote access is necessary, use secure methods such as Virtual Private Networks (VPNs), while keeping in mind that VPNs may have vulnerabilities and should be updated to the latest version. Organizations should perform a proper impact analysis and risk assessment before deploying defensive measures.