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AUSCERT External Security Bulletin Redistribution
mumble security update
7 February 2019
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-20743
Comment: This advisory references vulnerabilities in products which run on
platforms other than Debian. It is recommended that administrators
running mumble check for an updated version of the software for
their operating system.
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Package : mumble
Version : 1.2.8-2+deb8u1
CVE ID : CVE-2018-20743
Debian Bug : 919249
It has been found that the mumble-server mishandles multiple
concurrent requests that are persisted in the database, which allows
remote attackers to cause a denial of service (daemon hang or crash)
via a message flood. With the new security update a rate limiter is
added with Leaky-Bucket algorithm.
For Debian 8 "Jessie", this problem has been fixed in version
We recommend that you upgrade your mumble packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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