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CVE-2018-6334

9.8 · CRITICAL

Multipart-file uploads call variables to be improperly registered in the global scope.

Published Dec 31, 2018CWE-621EPSS 1.91%

Overview

CVE-2018-6334 is a critical-severity vulnerability. It was published on December 31, 2018 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 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

Multipart-file uploads call variables to be improperly registered in the global scope. In cases where variables are not declared explicitly before being used this can lead to unexpected behavior. This affects all supported versions of HHVM prior to the patch (3.25.1, 3.24.5, and 3.21.9 and below).

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

GitHubgithub.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cffRefhhvm.com/blog/2018/03/30/hhvm-3.25.2.htmlGitHubgithub.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cffRefhhvm.com/blog/2018/03/30/hhvm-3.25.2.html

How CyberStrike helps

Frequently asked questions

What is CVE-2018-6334?

CVE-2018-6334 is a critical-severity vulnerability. It was published on December 31, 2018 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2018-6334?

This vulnerability has a CVSS 3.1 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-2018-6334?

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-2018-6334?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-6334 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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