CVE-2021-29087

7.5 highEPSS 1.4%

High (7.5) in synology. EPSS 1.4% chance of exploitation in the next 30 days.

Improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability in webapi component in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to write arbitrary files via unspecified vectors.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 1.4% chance of exploitation in the next 30 days; higher than 72% of CVEs (scores of 2026-10-31)
CWE: CWE-22
Published: 2021-06-23
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

synology:diskstation_manager
synology:diskstation_manager_unified_controller

References

https://www.synology.com/security/advisory/Synology_SA_20_26
https://www.synology.com/security/advisory/Synology_SA_20_26

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