CVE-2020-1900

CRITICAL

HHVM < 4.32.3 and 4.33.0-4.62.0 - Use-After-Free in Object Unserialization

Title source: llm
STIX 2.1

Description

When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property array before inserting anything into it. Otherwise the array might resize, invalidating previously stored references. This pre-reservation was not occurring in HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0.

References (2)

Core 2

Scores

CVSS v3 9.8
EPSS 0.0138
EPSS Percentile 68.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-416
Status published
Products (8)
facebook/hhvm 4.57.0
facebook/hhvm 4.58.0
facebook/hhvm 4.58.1
facebook/hhvm 4.59.0
facebook/hhvm 4.60.0
facebook/hhvm 4.61.0
facebook/hhvm 4.62.0
facebook/hhvm < 4.32.3
Published Mar 11, 2021
Tracked Since Feb 18, 2026