USN-2477-1: libevent vulnerability

19 January 2015

libevent vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 14.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS


libevent could be made to crash or run programs if it processed specially crafted data.

Software Description

  • libevent - Asynchronous event notification library


Andrew Bartlett discovered that libevent incorrectly handled large inputs to the evbuffer API. A remote attacker could possibly use this issue with an application that uses libevent to cause 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 14.10
libevent-2.0-5 - 2.0.21-stable-1ubuntu1.14.10.1
Ubuntu 14.04 LTS
libevent-2.0-5 - 2.0.21-stable-1ubuntu1.14.04.1
Ubuntu 12.04 LTS
libevent-2.0-5 - 2.0.16-stable-1ubuntu0.1
Ubuntu 10.04 LTS
libevent-1.4-2 - 1.4.13-stable-1ubuntu0.1

To update your system, please follow these instructions:

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