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CVE-2018-6335 A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data

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.

Affected products and versions

Product Affected versions Fixed in
HHVM 3.25 3.25.0 → 3.25.3 No fix stated
HHVM 3.24.7 No fix stated
HHVM 3.22.0 No fix stated
HHVM 3.21 earliest → 3.21.11 3.21.11

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