What is CVE-2017-7639?

CVE-2017-7639 is a medium-severity vulnerability in QNAP Nas Proxy Server, classified under Improper Authentication. CVSS score: 5.3/10. Published 2018-06-05.

How severe is CVE-2017-7639?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in QNAP Nas Proxy Server

CVE-2017-7639

QNAP NAS application Proxy Server through version 1.2.0 does not authenticate requests properly. Successful exploitation can lead to change of the settings of Proxy Server.

Vulnerability class: Broken Authentication

Published 2018-06-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

QNAP Nas Proxy Server

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

www.qnap.com/en/security-advisory/nas-201806-01 (Vendor Advisory)
www.securitytracker.com/id/1041025 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-7639?: CVE-2017-7639 is a medium-severity vulnerability in QNAP Nas Proxy Server, classified under Improper Authentication. CVSS score: 5.3/10. Published 2018-06-05.
How severe is CVE-2017-7639?: Medium severity. CVSS v3 base score is 5.3 out of 10.