Some flaws take longer—a lot longer—than others to get fixed. The newly named HTTpoxy vulnerability was first discovered back in March 2001 and fixed in the open-source Perl programming language, but it has sat dormant in multiple other languages and applications until July 18.
The HTTPoxy flaw is a misconfiguration vulnerability in the HTTP_PROXY variable that is commonly used by Common Gateway Interface (CGI) environment scripts. The HTTPoxy flaw could potentially enable a remotely exploitable vulnerability on servers, enabling an attacker to run code or redirect traffic. The flaw at its core is a name space conflict between two different uses for a server variable known as HTTP Proxy.