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Case File

CVE-2009-4418

MEDIUM · CVSS 5 EPSS 0.97%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2009-12-24 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 5.0. It may lead to a denial-of-service condition.

CVE
CVE-2009-4418
Severity
MEDIUM
CVSS
5
EPSS
0.97%

Original NVD Description

The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a denial of service (resource consumption) via a deeply nested serialized variable, as demonstrated by a string beginning with a:1: followed by many {a:1: sequences.