Kerio Control 9.4.2 May 2026

Kerio Control 9.4.2: A Deep Dive into the Last Major Release of a Trusted Firewall

Introduction: The Legacy of Kerio Control

In the world of network security, few names have carried the quiet reliability of Kerio Control. Developed originally by Kerio Technologies (now owned by GFI Software), this unified threat management (UTM) appliance has been a staple for small to medium-sized businesses (SMBs), educational institutions, and branch offices for nearly two decades.

Why Upgrade

• Security-first: Even minor patches can close avenues attackers exploit; staying current minimizes risk.
• Operational stability: Fixes reduce the risk of service interruptions and support tickets.
• Better remote access: More reliable VPN behavior means fewer help-desk calls from remote workers.
• Easier troubleshooting: Cleaner logs and UI fixes speed up incident resolution.

Final takeaway

Kerio Control 9.4.2 is an incremental but important maintenance update: install it promptly on production devices after standard backups and checks to keep security posture current and systems stable. kerio control 9.4.2

2 has been released and is available for download. * Release date: Oct 11, 2022. * Build ID: 7279. support.keriocontrol.gfi.com Kerio Control 9.4.2p1 Release Notes Kerio Control 9

Kerio Control 9.4.2 – Administrator’s Guide

1. Overview

Kerio Control is a unified threat management (UTM) firewall and router. Version 9.4.2 includes: Final takeaway Kerio Control 9

Certificate Management: Renewed built-in Let's Encrypt certificates that had expired in previous builds.

6. Bandwidth Management

• Per-IP or per-group traffic shaping.
• Guaranteed minimum bandwidth, maximum throttling, and burst rates.
• Real-time traffic graphs and historical reporting.

and degraded responsiveness. This led to the quick deployment of 9.4.2 Patch 1 , which specifically fixed performance issues related to GRO (Generic Receive Offload) settings and VirtIO drivers in virtual environments. support.keriocontrol.gfi.com Summary of Fixed Issues (9.4.x Cycle) Problem Fixed Fixed XSS vulnerability in WebAdmin. Connectivity Renewed expired Let's Encrypt certificates. Fixed automatic delivery of weekly/monthly reports.