Sophos Firewall v18.5 GA is now available and new XGS-hardware also!

Sophos has just released the new Sophos Firewall v18.5 (formerly known as Sophos XG Firewall), and this new version add’s support for the new “XGS” hardware appliances (Only XGS is supported atm. later on the XG appliances will also get v18.5:

The XGS hardware – from Sophos community post ((+) Introducing Sophos Firewall and the new XGS Series hardware – Release Notes & News – Sophos (XG) Firewall – Sophos Community):

Today, we’re launching the first of our new XGS Series next-gen firewall appliances with Sophos Firewall OS version 18.5.

For network admins, this completely re-engineered hardware platform finally takes a common dilemma off the table: how to scale up protection for today’s highly diverse, distributed, and encrypted networks without throttling network performance.

Coupled with a highly attractive price, the new XGS Series is guaranteed to reshuffle the pack in the network firewall space.

Here are just three key highlights of this new release.

Dual processor architecture – powered by Xstream

Every XGS Series appliance has two hearts beating at its core: a high-performance multi-core x86 CPU, and an Xstream Flow processor to intelligently accelerate applications by offloading security-verified and trusted traffic to the FastPath.

This architecture allows us to retain the same flexibility to extend and scale protection as purely x86-based firewalls while also providing a performance boost that’s unhampered by the limitations of some legacy platform designs.

For example, with the programmable Xstream Flow processors, we can extend the offload capabilities in future software releases, providing additional performance improvements without changing the hardware.

Protection and performance

As much as we like to talk about speeds and feeds in the firewall space, the additional performance headroom in the XGS Series is there for a purpose: protection.

With about 90% of network traffic encrypted (source: Google Transparency Report) and almost 50% of malware using TLS to avoid detection (source: SophosLabs), organizations are leaving huge blind spots in their network visibility by not activating TLS inspection.

Just going by our own telemetry, about 90% of organizations don’t have TLS inspection activated on their firewalls. Even if we take into account that some of those may have separate solutions doing TLS inspection, it’s likely to be the minority rather than the majority. And aside from the security risk that poses, it’s pretty hard to create a policy for traffic that shows as “general” or “unknown”.

Before you all scream, “but TLS inspection breaks the internet,” Sophos Firewall includes native support for TLS 1.3 and provides a user interface which clearly shows if traffic has caused issues and how many users were affected. With just a couple of clicks, you can exclude problematic sites and applications without reverting to a less-than-adequate level of protection.

We’ve got the edge

The XGS Series includes multiple form factors that beat the all-important price per protected Mbps of many competitive models.

XGS Series appliances are equipped with high-speed interfaces to meet the diverse connectivity requirements of businesses large and small. In addition to the built-in copper, fiber, and a range of other ports on every model, add-on modules provide the flexibility to tailor your device connectivity to your unique environment – both today and in the future.

The XGS Series integrates further with edge infrastructure devices such as APX access points and our SD-RED Remote Ethernet Devices. With cloud-managed Zero-Trust Network Access and access layer network switches coming later this year, we’re bringing your network security to every edge.

Sophos Firewall OS v18.5

The new appliances come with the latest v18.5 software release, which not only provides support for the new hardware but also includes all the 18.x maintenance releases – many new capabilities and security improvements – since the v18 release.

For further information about Sophos Firewall and the XGS Series or to request a quote visit or

For the latest SophosLabs research on TLS, check out this article.

So what’s in the loop for 18,5?

All XGS Series next-generation firewalls have a dual-processor architecture, which combines a multi-core x86 CPU with a dedicated Xstream Flow Processor for hardware acceleration. The Xstream Flow Processor is a Network Processing Unit (NPU), which accelerates trusted traffic flows, freeing up resources on the host CPU for more resource-intensive tasks, such as TLS inspection and deep packet inspection.

What’s new in v18.5

Flexibility and performance enhancements

  • Version 18.0 delivered a data plane with a Virtual FastPath (VFP) to allow the offloading of trusted and previously security-verified traffic, using the same x86 CPU for the offloaded traffic. On the XGS Series, after inspecting the initial packets in a flow, the x86 CPU offloads trusted traffic to the Xstream FastPath, which runs on the Xstream Flow Processor and is specifically designed for FastPath operations.
  • The Xstream Flow Processor delivers and retrieves packets directly to and from the DPI engine’s main memory. These enhancements deliver a significant increase in the overall network performance with a 5x improvement in latency with the zero-copy operation and up to a 5x increase in SSL/TLS decryption performance versus the previous hardware models.
  • The Xstream architecture saves cycles of the x86 clock by lowering memory bandwidth usage and allowing both processors to update the cache.
  • Port density and diversity: XGS Series appliances offer an increased number of fixed ports and include some new port connectivity, such as Power over Ethernet (PoE), which is now built-in on some desktop models. They also offer a broad range of Flexi Port modules and add-on options to adapt and extend connectivity.

More information available here: v18.5 GA Release notes


The appliances can be compared here, I must say it’s promising, as I have seen it with my own eyes 🙂

XGS Next-Gen Firewall Appliances: Desktop, 1U and 2U Models (


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