CVE-2018-6332

Name: CVE-2018-6332
Creator: NVD / NIST
Published: 2018-12-03T14:29:00.457+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 1.09%

Last modified Jun 17, 2026

CVE-2018-6332 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. A potential denial-of-service issue in the Proxygen handling of invalid HTTP2 settings which can cause the server to spend disproportionate resources. This affects all supported versions of HHVM (3.24.3 and 3.21.7 and below) when using the proxygen server to handle HTTP2 requests.. EPSS estimates a 1.09% chance of exploitation in the next 30 days.

Description

A potential denial-of-service issue in the Proxygen handling of invalid HTTP2 settings which can cause the server to spend disproportionate resources. This affects all supported versions of HHVM (3.24.3 and 3.21.7 and below) when using the proxygen server to handle HTTP2 requests.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

1.09%

61.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Facebook	Hhvm	<= 3.21.7
Facebook	Hhvm	3.24.3

References

https://hhvm.com/blog/2018/03/15/hhvm-3.25.htmlVendor Advisory
https://hhvm.com/blog/2018/03/15/hhvm-3.25.htmlVendor Advisory

Timeline

Published: Dec 3, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6332?

How severe is CVE-2018-6332?

CVE-2018-6332 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 1.09% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6332?

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-2018-6332?

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

Scan your code now

Source: NVD / NIST