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CVE-2017-12933

9.8 · CRITICAL

The finish_nested_data function in ext/standard/var_unserializer.re in PHP before 5.6.31, 7.0.x before 7.0.21, and 7.1.x before 7.1.7 is prone to a buffer over-read while unserializing untrusted data.

Published Aug 18, 2017CWE-125EPSS 6.94%

Overview

CVE-2017-12933 is a critical-severity vulnerability. It was published on August 18, 2017 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.0 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The finish_nested_data function in ext/standard/var_unserializer.re in PHP before 5.6.31, 7.0.x before 7.0.21, and 7.1.x before 7.1.7 is prone to a buffer over-read while unserializing untrusted data. Exploitation of this issue can have an unspecified impact on the integrity of PHP.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refphp.net/ChangeLog-5.phpRefphp.net/ChangeLog-7.phpRefwww.securityfocus.com/bid/99490Refaccess.redhat.com/errata/RHSA-2018:1296Refbugs.php.net/bug.php?id=74111Refusn.ubuntu.com/3566-1/Refusn.ubuntu.com/3566-2/Refwww.debian.org/security/2018/dsa-4080Refwww.debian.org/security/2018/dsa-4081Refphp.net/ChangeLog-5.php

How CyberStrike helps

Frequently asked questions

What is CVE-2017-12933?

CVE-2017-12933 is a critical-severity vulnerability. It was published on August 18, 2017 and has a CVSS 3.0 base score of 9.8 (CRITICAL).

How severe is CVE-2017-12933?

This vulnerability has a CVSS 3.0 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2017-12933?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-12933?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-12933 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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