A DLL is a file format used for holding multiple processes for Windows programs.
In other words, a hacker could make the computer run code that it might otherwise reject.
On May 28, 2019, Dell released fixes provided by PC-Doctor for affected SupportAssist versions in Dell PCs.
Dell SupportAssist is not made by PC-Doctor.
This means besides Dell PCs, other original equipment manufacturers that depend on PC-Doctor are also affected.
source: www.techworm.net