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CVE-2021-28099

• Severity: medium (CVSS 4.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-23 · updated 2026-06-17
• Weakness: CWE-330

Description

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 OSS Hollow: all versions

References

• https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md
• https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md

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