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CVE-2013-5704 affects Apache HTTP Server handling of HTTP trailer fields in requests using chunked transfer coding. Trailer fields can be merged into the inbound request-header collection after modules, including mod_headers, have already processed the original headers. A remote client can therefore place a header in the chunked-message trailer to reintroduce a header removed by a RequestHeader unset directive, bypassing the intended header restriction. Apache characterized the behavior as not inherently a security issue in httpd itself because modules handling gateway behavior are expected to safely process trailer fields.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Apache HTTP Server flaw in chunked-request Trailer-header processing that permits additional HTTP headers to be set after other modules have processed headers, potentially bypassing mod_headers restrictions.
An Apache HTTP Server flaw that allows malicious chunked requests to use HTTP Trailer headers to add headers after module header processing, potentially bypassing mod_headers restrictions.
An Apache HTTP Server (httpd) flaw involving HTTP Trailer headers in chunked requests that can bypass mod_headers-defined header restrictions.
An Apache HTTP Server (httpd) flaw in handling HTTP Trailer headers in chunked requests that permits a client to add headers after other modules have processed headers, potentially bypassing mod_headers restrictions.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.