olemus
ohtlik proksi, mis on konfigureeritud
igale netikasutajale kättesaadavaks ja
soodustab spämmi levikut;
spämmijad skaneerivad võrku nende leidmiseks
= a proxy server that is configured so that anyone can use it;
widely used by spammers because the proxy hides the spammer's IP address from recipients

ülevaateid
https://en.wikipedia.org/wiki/Open_proxy

näiteid
https://curlie.org/Computers/Internet/Proxying_and_Filtering/Hosted_Proxy_Services/Free/Proxy_Lists

turvalisus
https://itstillworks.com/dangers-using-proxy-servers-2175.html

https://www.zscaler.com/blogs/research/top-abuses-open-web-proxies

https://www.cisco.com/c/en/us/support/docs/security/web-security-appliance/117933-qa-csc-00.html

https://arxiv.org/pdf/1806.10258.pdf

https://blog.projectdiscovery.io/abusing-reverse-proxies-internal-access/