CVE-2020-1899

2021-03-1101:15:14

Google

osv.dev

7.1 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

55.1%

JSON

The unserialize() function supported a type code, “S”, which was meant to be supported only for APC serialization. This type code allowed arbitrary memory addresses to be accessed as if they were static StringData objects. This issue affected 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.