Ho PHP-FPM, mookameli oa ts'ebetso ea FastCGI o kenyellelitsoe kabong ea mantlha ea PHP ho qala ka lekala la 5.3, ho se ho khethiloe kotsi e tebileng ea CVE-2021-21703, e lumellang mosebelisi ea se nang tokelo ea ho amohela moeti hore a phethe khoutu e nang le litokelo tsa metso. Bothata bo hlaha ho li-server tse sebelisang PHP-FPM, hangata li sebelisoa hammoho le Nginx, ho tsamaisa mangolo a PHP. Bafuputsi ba hlokometseng bothata ba khonne ho lokisa mohlala o sebetsang oa tlatlapo.