USN-5048-1 fixed a vulnerability in Inetutils for Ubuntu 18.04 LTS and Ubuntu
20.04 LTS. This update provides the corresponding fixes for Ubuntu 16.04 ESM.
Original advisory details:
It was discovered that Inetutils telnet server allows remote attackers to
execute arbitrary code via short writes or urgent data. An attacker could use
this vulnerability to cause a DoS or possibly execute arbitrary code.