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CVE-2025-66200 is a moderate-severity vulnerability in Apache HTTP Server in configurations that combine mod_userdir and suexec with AllowOverride FileInfo. A user who is permitted to use the RequestHeader directive in an .htaccess file can manipulate request handling so that certain CGI scripts execute under an unexpected user ID, bypassing the intended user separation enforced by the mod_userdir and suexec combination. The issue affects Apache HTTP Server versions 2.4.7 through 2.4.65 and was fixed in version 2.4.66.
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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.
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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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability affecting IBM HTTP Server configurations with mod_userdir and mod_suexec loaded and suexec added by an administrator.
An Apache open source vulnerability affecting Apple software on macOS Sequoia.
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.