Rodney Grimes of the FreeBSD Security Team has announced that FreeBSD version 12.0 is reaching its end-of-life, effective February 29, 2020. Users are highly encouraged to move to the next stable release that is still receiving updates, which is 12.1.

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> Dear FreeBSD community,
> 
> As of February 29, 2020, FreeBSD 12.0 will reach end-of-life and will no 
> longer
> be supported by the FreeBSD Security Team.  Users of FreeBSD 12.0 are strongly
> encouraged to upgrade to a newer release as soon as possible.
> 
> The currently supported branches and releases and their expected end-of-life
> dates are:
> 
>  +--------------------------------------------------------------------------+
>  |   Branch    |   Release    |  Release Date     |      Estimated EoL      |
>  +-------------+--------------+-------------------+-------------------------+
>  | stable/12   | N/A          | N/A               | June 30, 2024           |
>  +-------------+--------------+-------------------+-------------------------+
releng/12.0 should be listed here in this table, it is still "Supported".

>  | releng/12.1 | 12.1-RELEASE | November 4, 2019  | 12.2-RELEASE + 3 months |
>  +-------------+--------------+-------------------+-------------------------+
>  | stable/11   | N/A          | N/A               | September 30, 2021      |
>  +-------------+--------------+-------------------+-------------------------+
>  | releng/11.3 | 11.3-RELEASE | July 9, 2019      | 11.4-RELEASE + 3 months |
>  +--------------------------------------------------------------------------+
> 
> Please refer to https://security.freebsd.org/ for an up-to-date list of
> supported releases and the latest security advisories.
> 
> - --
> The FreeBSD Security Team

Original announcement: https://www.mail-archive.com/freebsd-security@freebsd.org/msg07438.html