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USN-3950-1: ZNC vulnerability

18 April 2019

ZNC could be made to crash or run programs if it received specially crafted network traffic.



  • znc - advanced modular IRC bouncer


It was discovered that ZNC incorrectly handled certain invalid encodings.
An authenticated remote user could use this issue to cause ZNC to crash,
resulting in a denial of service, or possibly execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.10

In general, a standard system update will make all the necessary changes.