Critical Auth Bypass in Anritsu Remote Spectrum Monitors
⚠️ Anritsu Remote Spectrum Monitor models MS27100A, MS27101A, MS27102A, and MS27103A contain an inherent authentication bypass (CVE-2026-3356) that permits unauthenticated network users to access and control the device management interface. The vendor reports no planned patch and confirms the issue is a design limitation with no configurable authentication. Successful exploitation can expose signal data, change operational settings, or render devices unavailable. CISA recommends isolating affected devices and restricting network access.
