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CVE-2015-6834

CriticalPublished

Multiple use-after-free vulnerabilities in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 allow remote attackers to execute arbitrary code...

Published: May 16, 2016
Updated: Aug 6, 2024
Assigning CNA: microfocus
Evidence observed: Sep 9, 2015

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.0

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

42.6%

Moderate · next 30 days

Percentile: 98.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Multiple use-after-free vulnerabilities in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 allow remote attackers to execute arbitrary code via vectors related to (1) the Serializable interface, (2) the SplObjectStorage class, and (3) the SplDoublyLinkedList class, which are mishandled during unserialization.

Sources

PHP 5.4/5.5/5.6 - SplDoublyLinkedList 'Unserialize()' Use-After-FreeExploit
Taoguang Chen · php · Sep 9, 2015
PHP 5.4/5.5/5.6 - SplObjectStorage 'Unserialize()' Use-After-FreeExploit
Taoguang Chen · php · Sep 9, 2015

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