CVE-2015-6831

Name: CVE-2015-6831
Creator: NVD / NIST
Published: 2016-01-19T05:59:02.637+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.3/10EPSS 7.06%

Last modified Jun 17, 2026

CVE-2015-6831 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. Multiple use-after-free vulnerabilities in SPL in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 allow remote attackers to execute arbitrary code via vectors involving (1) ArrayObject, (2) SplObjectStorage, and (3) SplDoublyLinkedList, which are mishandled during unserialization.. EPSS estimates a 7.06% chance of exploitation in the next 30 days.

Description

Multiple use-after-free vulnerabilities in SPL in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 allow remote attackers to execute arbitrary code via vectors involving (1) ArrayObject, (2) SplObjectStorage, and (3) SplDoublyLinkedList, which are mishandled during unserialization.

Metrics

CVSS 3.1

7.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS Probability

7.06%

93.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Php	Php	< 5.4.44
Php	Php	>= 5.5.0, < 5.5.28
Php	Php	>= 5.6.0, < 5.6.12
Debian	Debian Linux	7.0
Debian	Debian Linux	8.0

References

Timeline

Published: Jan 19, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-6831?

How severe is CVE-2015-6831?

CVE-2015-6831 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 7.06% probability of exploitation in the next 30 days.

How do I fix CVE-2015-6831?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-6831?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST