CVE-2021-33183

Severity: high (CVSS 7.9 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: 2021-06-01 · updated 2026-06-17
Weakness: CWE-22

Description

Improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability container volume management component in Synology Docker before 18.09.0-0515 allows local users to read or write arbitrary files via unspecified vectors.

Affected products

Synology Docker: before 18.09.0-0515 — fixed in 18.09.0-0515

How to fix

Upgrade to a fixed version: Synology Docker 18.09.0-0515. Check the vendor advisory for mitigations.

References

https://www.synology.com/security/advisory/Synology_SA_21_08
https://www.synology.com/security/advisory/Synology_SA_21_08

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