CVE-2011-4885: PHP before 5.3.9 computes hash values for form parameters without restricting the ability to trigger hash c...

Security readout for executives and security teams

This flaw lets a remote user make older PHP servers spend excessive CPU processing many form parameters. The business impact is service disruption, not data theft. Systems running PHP before 5.3.9, or unpatched vendor builds from that era, are the main concern. Exposure is likely limited to legacy PHP deployments or appliances bundling vulnerable PHP. Internet-facing forms, APIs, and endpoints accepting large request parameter sets are the most relevant attack surface. Treat this as a legacy exposure cleanup item unless vulnerable PHP is internet-facing or business-critical. Public exploit references increase urgency for any unpatched external service. Mitigation focus: Upgrade PHP to 5.3.9 or a vendor package that backports the fix.; Check Debian, Red Hat, SUSE, Mandriva, HP, and Oracle guidance for platform-specific updates.; Prioritize internet-facing legacy PHP applications and embedded products..

Prepared

Jun 27, 2026, 17:28 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.