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CVE-2011-3607 is an integer-overflow vulnerability in Apache HTTP Server's ap_pregsub function. In affected 2.0.x releases through 2.0.64 and 2.2.x releases through 2.2.21, expansion of crafted SetEnvIf input can cause an allocation-size calculation to wrap, resulting in a heap-based buffer overflow. The flaw is reachable through mod_setenvif processing of a malicious per-directory SetEnvIf configuration in conjunction with a crafted HTTP request header.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An integer overflow vulnerability in Apache HTTP Server core ap_pregsub that can be triggered through malicious .htaccess content, for example via mod_setenvif.
A low-severity local privilege-escalation vulnerability in Apache HTTP Server's ap_pregsub function. With mod_setenvif enabled, a local user able to supply a crafted .htaccess file and HTTP request header can trigger an integer overflow resulting in a heap-based buffer overflow.
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.