Release Notes for Zabbix 1.8.21

Zabbix Team is pleased to announce the availability of Zabbix 1.8.21.

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 1.8.21. Download it from download.

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

Fixes and minor improvements

ZBX-3407 fixed NVPS query to not fail on DB2
ZBX-8608 added support of IP masks for action conditions
ZBX-8151 fixed XXE vulnerability on XML import using obsolete libxml versions; thanks to pnig0s@Freebuf for the report
ZBX-8343 fixed a bug in binary heap that could cause a slightly inconsistent ordering of elements in the queue
ZBX-8198 decreased verbosity of Windows agent with DebugLevel=4
ZBX-7930 improved SQL performance and execution time in Maintenance page

Installation and Upgrade Notes


See Zabbixマニュアル for full details.


See Upgrade procedure for upgrade options and instructions. For version specific upgrade notes, see Upgrade notes for 1.8.21.

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 営業への問い合わせ for pricing and more details.


Zabbix 1.8 Manual