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CVE-2015-3183 is an HTTP request-smuggling vulnerability in Apache HTTP Server's chunked transfer-coding implementation. Affected versions improperly parse chunk headers, including large chunk-size values and invalid chunk-extension characters. This can cause Apache httpd and an upstream or front-end HTTP proxy to interpret the boundaries or length of the same crafted chunked HTTP request differently.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A historical IBM HTTP request smuggling vulnerability mentioned for comparison as prior precedent.
HTTP request-smuggling vulnerabilities in Apache httpd's chunked-transfer-encoding request and response parsing, caused by inconsistent parsing between httpd and a front-end HTTP proxy.
An HTTP request-smuggling vulnerability in httpd's parsing of chunked transfer encoding, allowing a remote attacker to cause parsing discrepancies between httpd and a front-end HTTP proxy.
HTTP request-smuggling vulnerability in the Apache httpd chunked-transfer-encoding request parser, caused by inconsistent parsing between httpd and a front-end proxy.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.