What is CVE-2017-11156?

CVE-2017-11156 is a high-severity vulnerability in Synology Download Station, classified under Incorrect Default Permissions. CVSS score: 7.8/10. Published 2017-08-14.

How severe is CVE-2017-11156?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Synology Download Station

CVE-2017-11156

Synology Download Station 3.8.x before 3.8.5-3475 and 3.x before 3.5-2984 uses weak permissions (0777) for ui/dlm/btsearch directory, which allows remote authenticated users to execute arbitrary code by uploading an executable via unspecified vectors.

Published 2017-08-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.023 (82.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000

Affected products

Synology Download Station — versions 3.2-2295, 3.3-2382, 3.3-2383
Synology Download Station — versions 3.8.x before 3.8.5-3475 and 3.x before 3.5-2984

Weakness classification (CWE)

References

www.synology.com/en-global/support/security/Synology_SA_17_28_Download_Station (Vendor Advisory)

Frequently asked questions

What is CVE-2017-11156?: CVE-2017-11156 is a high-severity vulnerability in Synology Download Station, classified under Incorrect Default Permissions. CVSS score: 7.8/10. Published 2017-08-14.
How severe is CVE-2017-11156?: High severity. CVSS v3 base score is 7.8 out of 10.