Sophos Firewall (SFOS)

Sophos Firewall (SFOS) at a glance

Sophos Firewall OS (SFOS) is the operating system on Sophos XG/XGS firewalls, common in SMBs and mid-market. Sophos ships SFOS releases plus hotfixes and security advisories; as a perimeter device, timely patching is essential — Sophos firewalls have been the target of actively exploited flaws.

For admins the perimeter rules apply, sharpened: never expose the admin or VPN portal to the WAN unprotected, and apply hotfixes promptly (Sophos can push some automatically — keep that enabled). Take a config backup before firmware changes, mind the order on HA pairs, and verify VPN and rules afterwards. Track the SFOS version and its support window per model. Subscribe to Sophos advisories; patchletter surfaces new SFOS builds so critical updates aren't missed.