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USN-5173-1: libmodbus vulnerabilities

6 December 2021

libmodbus could be made to crash if it received specially crafted input.



  • libmodbus - Library to send/receive data according to the Modbus protocol


It was discovered that libmodbus incorrectly handled inputs. An attacker
could possibly use this issue to cause a denial of service or other
unspecified impact.

Update instructions

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

Ubuntu 18.04

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