CVE-2017-5340

Name: CVE-2017-5340
Creator: NVD / NIST
Published: 2017-01-11T06:59:00.16+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 16.69%

Last modified Jun 17, 2026

CVE-2017-5340 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Zend/zend_hash.c in PHP before 7.0.15 and 7.1.x before 7.1.1 mishandles certain cases that require large array allocations, which allows remote attackers to execute arbitrary code or cause a denial of service (integer overflow, uninitialized memory access, and use of arbitrary destructor function pointers) via crafted serialized data.. EPSS estimates a 16.69% chance of exploitation in the next 30 days.

Description

Zend/zend_hash.c in PHP before 7.0.15 and 7.1.x before 7.1.1 mishandles certain cases that require large array allocations, which allows remote attackers to execute arbitrary code or cause a denial of service (integer overflow, uninitialized memory access, and use of arbitrary destructor function pointers) via crafted serialized data.

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

16.69%

96.6th 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, < 7.0.15
Php	Php	>= 7.1.0, < 7.1.1
Netapp	Clustered Data Ontap	All versions

References

http://www.securityfocus.com/bid/95371Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037659Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:1296Third Party Advisory
https://bugs.php.net/bug.php?id=73832Exploit, Issue Tracking, VDB Entry, Vendor Advisory
https://github.com/php/php-src/commit/4cc0286f2f3780abc6084bcdae5dce595daa3c12Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20180112-0001/Third Party Advisory
http://www.securityfocus.com/bid/95371Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037659Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:1296Third Party Advisory
https://bugs.php.net/bug.php?id=73832Exploit, Issue Tracking, VDB Entry, Vendor Advisory
https://github.com/php/php-src/commit/4cc0286f2f3780abc6084bcdae5dce595daa3c12Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20180112-0001/Third Party Advisory

Timeline

Published: Jan 11, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-5340?

How severe is CVE-2017-5340?

CVE-2017-5340 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 16.69% probability of exploitation in the next 30 days.

How do I fix CVE-2017-5340?

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-2017-5340?

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

Scan your code now

Source: NVD / NIST