Release Notes for Zabbix 2.2.21

Zabbix Team is pleased to announce the availability of Zabbix 2.2.21.

Zabbix is an enterprise-class open source distributed monitoring solution. Zabbix is released under the GPL, thus it is free of charge for both commercial and non-commercial use. A complete text of the license is available at

This document contains the release notes for Zabbix 2.2.21. Download it from downloads.

The following sections describe the release in details and provide late-breaking or other information that supplements its main documentation.

New Features and Improvements

implemented URL validation as optional; improved URL validation

Bug Fixes

fixed database configuration error reporting and message filtering when messages are received from clear_messages function
fixed parsing "request" parameter for URLs without input parameters
fixed cookie http-only attribute to prevent XSS attacks
fixed reflected XSS vulnerability in popup forms
fixed check for permissions to enable/disable actions
fixed missed url search part in request login parameter
fixed undefined index when setting strict-transport-security http header
fixed multiple security issues
fixed crash of VMware collector with DebugLevel=4

Installation and Upgrade Notes


See Zabbix Manual for full details.


Recompile Zabbix binaries and update front-end PHP files. Execute a database patch if migrating from Zabbix 1.8.x. See Zabbix Manual for a detailed upgrade procedure.

Commercial support

Zabbix Company provides a full range of Professional Services. We also provide trouble-free Upgrade Service for easy migration from earlier versions of Zabbix. Please contact Sales for pricing and more details.


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