MEDIUM
CVE-2021-28099
CWE-330Published: March 23, 2021· Updated: Jun 17, 2026
4.4
CVSS v3.1
Official 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.
Technical Analysis
CVE-2021-28099 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Affected Vendors & Products
netflix1 product(s)
hollow
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories
All References (2)
Quick Facts
CVE IDCVE-2021-28099
CVSS Score4.4 / 10
SeverityMEDIUM
WeaknessCWE-330
CISA KEVNo
Affected1 vendor(s)
PublishedMar 23, 2021
Related CVEs (CWE-330)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-28099 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.