The　DNS　over　HTTPS　(Hypertext　Transfer　Protocol　Secure)　(DoH)　is　a　new　technology　that　encrypts　DNS　traffic,　enhancing　the　privacy　and　security　of　end-users.　However,　the　adoption　of　DoH　is　still　facing　several　research　challenges,　such　as　ensuring　security,　compatibility,　standardization,　performance,　privacy,　and　increasing　user　awareness.　DoH　significantly　impacts　network　security,　including　better　end-user　privacy　and　security,　challenges　for　network　security　professionals,　increasing　usage　of　encrypted　malware　communication,　and　difficulty　adapting　DNS-based　security　measures.　Therefore,　it　is　important　to　understand　the　impact　of　DoH　on　network　security　and　develop　new　privacy-preserving　techniques　to　allow　the　analysis　of　DoH　traffic　without　compromising　user　privacy.　This　paper　provides　an　in-depth　analysis　of　the　effects　of　DoH　on　cybersecurity.　We　discuss　various　techniques　for　detecting　DoH　tunneling　and　identify　essential　research　challenges　that　need　to　be　addressed　in　future　security　studies.　Overall,　this　paper　highlights　the　need　for　continued　research　and　development　to　ensure　the　effectiveness　of　DoH　as　a　tool　for　improving　privacy　and　security.　Copyright　©　2024　The　Authors.　Published　by　Tech　Science　Press.