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CVE-2016-5387 identifies the Apache HTTP Server mitigation for the HTTPoxy issue affecting httpd through 2.4.23. When processing CGI-related requests, httpd could convert an attacker-controlled HTTP Proxy request header into the HTTP_PROXY environment variable supplied to CGI scripts. Certain HTTP client implementations used this environment variable as outbound proxy configuration, allowing untrusted request data to influence an application's outbound HTTP routing. The CVE record notes that this identifier was assigned to the mitigation rather than to a vulnerability identifier itself.
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Apache HTTP Server CGI HTTP_PROXY environment-variable injection flaw (HTTPoxy) that permits a remote attacker to influence outbound HTTP requests made by susceptible CGI scripts by supplying a malicious Proxy header.
An Apache HTTPD CGI environment-variable injection issue in which an attacker-controlled Proxy request header can set HTTP_PROXY and redirect outbound HTTP requests made by a CGI script through an attacker-controlled proxy.
An Apache HTTP Server (httpd) HTTPoxy vulnerability in which an attacker-controlled Proxy request header can set HTTP_PROXY for CGI scripts, potentially redirecting CGI-initiated outbound HTTP requests through an attacker-controlled proxy.
Apache HTTP Server httpd CGI environment-variable injection flaw: an attacker-controlled Proxy request header could set HTTP_PROXY and cause vulnerable CGI-script HTTP clients to route outbound requests through an attacker-controlled proxy.
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Cross-references every affected SKU, including bundled OEM variants.
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