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.
References (2)
Core 2
Core References
Vendor Advisory x_refsource_misc
https://hhvm.com/blog/2018/05/04/hhvm-3.25.3.html
Patch, Third Party Advisory x_refsource_misc
https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56
Scores
CVSS v3
7.5
EPSS
0.0069
EPSS Percentile
72.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-20
CWE-400
Status
published
Products (3)
facebook/hhvm
3.24.6
facebook/hhvm
3.25.2
facebook/hhvm
< 3.21.10
Published
Dec 31, 2018
Tracked Since
Feb 18, 2026