CVE-2021-28099: Netflix Hollow

Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days.

In Netflix OSS Hollow, since the Files.exists(parent) is run before creating the directories, an attacker can pre-create these directories with wide permissions. Additionally, since an insecure source of randomness is used, the file names to be created can be deterministically calculated.

Affected products

• Netflix Hollow: affected versions not specified

Published 2021-03-23. Last modified 2026-06-17.