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Date: Fri, 13 Dec 2019 12:44:35 +0200
From: Aki Tuomi <>
To: oss-security <>
Subject: CVE-2019-19722: Critical vulnerability in Dovecot

Open-Xchange Security Advisory 2019-12-13
Product: Dovecot IMAP/POP3 Server
Vendor: OX Software GmbH
Internal reference: DOV-3719
Vulnerability type: NULL Pointer Dereference (CWE-476)
Vulnerable version: 2.3.9
Vulnerable component: push notification driver
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version:
Researcher credits: Frederik Schwan, Michael Stilkerich
Vendor notification: 2019-12-10
Solution date: 2019-12-12
Public disclosure: 2019-12-13
CVE reference: CVE-2019-19722
Vulnerability Details:
Mail with group address as sender will cause a signal 11 crash in push
notification drivers. Group address as recipient can cause crash in some
Repeated delivery attempts are made for the problematic mail, causing
queueing in MTA.
Steps to reproduce:
1. Configure dovecot with push notifications enabled, such as OX push
notification driver. This can also be observed with 3rd party plugin XAPS.
2. Send mail a group address as sender
Operators should update to the latest Patch Release.

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