CVE-2018-6332

MEDIUM

HHVM < 3.21.7 - Denial of Service via Proxygen HTTP2 Settings Handling

Title source: llm

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.

References (1)

Core 1

Core References

Vendor Advisory x_refsource_misc

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

Scores

CVSS v3 5.9

EPSS 0.0109

EPSS Percentile 61.1%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-19 CWE-400

Status published

Products (2)

facebook/hhvm 3.24.3

facebook/hhvm < 3.21.7

Published Dec 03, 2018

Tracked Since Feb 18, 2026