CVE-2004-1020: The addslashes function in PHP 4.3.9 does not properly escape a NULL (/0) character, which may allow remote...

Security readout for executives and security teams

This old PHP issue concerns a failed NULL-character escape in addslashes in PHP 4.3.9. It mattered when vulnerable applications used include or require paths and relied on magic_quotes_gpc for protection. The CVE record says the candidate was previously rejected and remains disputed, so business urgency depends on whether legacy PHP 4.3.9 systems still exist. Exposure is likely limited to legacy PHP 4.3.9 environments and applications using include or require with user-influenced paths. Modern supported PHP deployments are unlikely to match this exact condition, but old appliances, archived sites, or unmanaged servers should be checked. Treat this as a legacy-technology hygiene issue unless PHP 4.3.9 is still present. If found on internet-facing systems, prioritize remediation because arbitrary file reads can expose secrets. If no legacy PHP exists, this CVE should not drive urgent action. Mitigation focus: Inventory systems still running PHP 4.3.9 or related vendor packages.; Review PHP, distribution, and vendor advisories before applying fixes.; Upgrade legacy PHP installations to supported vendor-maintained versions..

Prepared

Jun 30, 2026, 02:08 UTC (UTC+00:00)

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