Sophos Firewall OS v18.5 MR5 is Now Available

The product team is pleased to announce the maintenance release update for Sophos Firewall OS v18.5 with important security and reliability fixes.

Sophos Firewall OS v18.5 MR5 Highlight:

  • Anti-Malware Engine - Anti-malware engines and associated components were upgraded to full 64-bit operation to provide optimal performance and future support. Note that the secondary malware scan engine, Avira, will no longer provide detection updates for the 32-bit version after December 31, 2022.  Anyone using Avira will need to upgrade to v19 MR1 (released July 2022), v19.5 GA (released Nov 2022) or v18.5 MR5 before the end of the year or switch to just using the Sophos engine.
  • 40+ important issues, security and reliability fixes.

Check out the v18.5 MR5 release notes for full details.

How to get it

You can manually download SFOS v18.5 MR5 from the Sophos Licensing Portal and update your firewall anytime. v18.5 MR5 will NOT be pushed as an in-product update since the latest available firmware on the web admin console will show the latest 19.0 and 19.5 versions.

18.5 MR5 is a fully supported upgrade from all previous versions of v18.5. Once your firewall is on v18.5 MR5, you can upgrade to the future (to be released) maintenance releases which will be v19.0 MR2 and v19.5 MR1. You cannot upgrade from v18.5 MR5 to v19.0 MR1 or v19.5 GA. For more details, please see the Upgrade information tab in the release notes.


Sophos Firewall Product Team