What is CVE-2018-6335?

CVE-2018-6335 is a vulnerability in Facebook HHVM where a malformed h2 frame can cause a 'std::out_of_range' exception when parsing priority metadata, leading to a denial-of-service.

What is the severity of CVE-2018-6335?

The severity of CVE-2018-6335 is rated as high with a CVSS score of 7.5.

How can I fix CVE-2018-6335?

To fix CVE-2018-6335, it is recommended to upgrade HHVM to version 3.25.3 or later, which contains the fix for this vulnerability.

Vulnerability/
CVE-2018-6335

high

7.5

CWE

20 400

31/12/2018

5/8/2024

CVE-2018-6335: Input Validation

Q: How does CVE-2018-6335 affect HHVM?

CVE-2018-6335 affects all supported versions of HHVM (3.25.2, 3.24.6, and 3.21.10 and below) when using the proxygen server to handle HTTP2 requests.

Q: Are there any references for CVE-2018-6335?

Yes, you can find more information about CVE-2018-6335 in the following references: [GitHub commit](https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56) and [HHVM blog post](https://hhvm.com/blog/2018/05/04/hhvm-3.25.3.html).

First published: Mon Dec 31 2018(Updated: )

A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data. This behavior can lead to denial-of-service. This affects all supported versions of HHVM (3.25.2, 3.24.6, and 3.21.10 and below) when using the proxygen server to handle HTTP2 requests.

Credit: cve-assign@fb.com

Affected Software	Affected Version	How to fix
Facebook HHVM	<=3.21.10
Facebook HHVM	=3.24.6
Facebook HHVM	=3.25.2

Remedy

https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56

Never miss a vulnerability like this again

Reference Links

Frequently Asked Questions

What is CVE-2018-6335?
CVE-2018-6335 is a vulnerability in Facebook HHVM where a malformed h2 frame can cause a 'std::out_of_range' exception when parsing priority metadata, leading to a denial-of-service.
How does CVE-2018-6335 affect HHVM?
CVE-2018-6335 affects all supported versions of HHVM (3.25.2, 3.24.6, and 3.21.10 and below) when using the proxygen server to handle HTTP2 requests.
What is the severity of CVE-2018-6335?
The severity of CVE-2018-6335 is rated as high with a CVSS score of 7.5.
How can I fix CVE-2018-6335?
To fix CVE-2018-6335, it is recommended to upgrade HHVM to version 3.25.3 or later, which contains the fix for this vulnerability.
Are there any references for CVE-2018-6335?
Yes, you can find more information about CVE-2018-6335 in the following references: [GitHub commit](https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56) and [HHVM blog post](https://hhvm.com/blog/2018/05/04/hhvm-3.25.3.html).

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agent/softwarecombine
agent/first-publish-date
collector/mitre-cve
source/MITRE
vendor/facebook
canonical/facebook hhvm
version/facebook hhvm/3.21.10
version/facebook hhvm/3.24.6
version/facebook hhvm/3.25.2

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