CVE-2025-66620: Columbiaweather Weather Microserver Firmware

High severity, CVSS 7.2. EPSS: 0.5% chance of exploitation in the next 30 days.

An unused webshell in MicroServer allows unlimited login attempts, with sudo rights on certain files and directories. An attacker with admin access to MicroServer can gain limited shell access, enabling persistence through reverse shells, and the ability to modify or remove data stored in the file system.

Affected products

• Columbiaweather Weather Microserver Firmware: before MS_4.1_14142 (fixed in MS_4.1_14142)

Published 2026-01-07. Last modified 2026-10-07.