CVE-2016-4344

Name: CVE-2016-4344
Creator: NVD / NIST
Published: 2016-05-22T01:59:18.573+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 5.17%

Last modified Jun 17, 2026

CVE-2016-4344 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Integer overflow in the xml_utf8_encode function in ext/xml/xml.c in PHP before 7.0.4 allows remote attackers to cause a denial of service or possibly have unspecified other impact via a long argument to the utf8_encode function, leading to a heap-based buffer overflow.. EPSS estimates a 5.17% chance of exploitation in the next 30 days.

Description

Integer overflow in the xml_utf8_encode function in ext/xml/xml.c in PHP before 7.0.4 allows remote attackers to cause a denial of service or possibly have unspecified other impact via a long argument to the utf8_encode function, leading to a heap-based buffer overflow.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

5.17%

91.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions
Php	Php	>= 7.0.0, < 7.0.4

References

http://php.net/ChangeLog-7.phpRelease Notes, Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/04/28/2Mailing List, Third Party Advisory
https://bugs.php.net/bug.php?id=71637Exploit, Issue Tracking, Patch, Vendor Advisory
http://php.net/ChangeLog-7.phpRelease Notes, Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/04/28/2Mailing List, Third Party Advisory
https://bugs.php.net/bug.php?id=71637Exploit, Issue Tracking, Patch, Vendor Advisory

Timeline

Published: May 22, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-4344?

How severe is CVE-2016-4344?

CVE-2016-4344 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 5.17% probability of exploitation in the next 30 days.

How do I fix CVE-2016-4344?

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-2016-4344?

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

Scan your code now

Source: NVD / NIST