CVE-2018-6335

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CVSS 3.1

7.5 high

EPSS

1%p72

Published

Dec 31, 2018 (Dec 31, 2018)

Modified

Jun 17, 2026

Description

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.

Vendors: facebook
Products: hhvm
Weakness: CWE-400, CWE-20
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (1.5%)

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