What is CVE-2018-19957?

CVE-2018-19957 is a medium-severity vulnerability in QNAP Qts, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 6.1/10. Published 2021-09-10.

How severe is CVE-2018-19957?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Vulnerability in QNAP Qts

CVE-2018-19957

A vulnerability involving insufficient HTTP security headers has been reported to affect QNAP NAS running QTS, QuTS hero, and QuTScloud. This vulnerability allows remote attackers to launch privacy and security attacks. We have already fixed this vulnerability in the following versions: QTS 4.5.4.1715 build 20210630 and later QuTS hero h4.5.4.1771 build 20210825 and later QuTScloud c4.5.6.1755 build 20210809 and later

Published 2021-09-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

QNAP Qts
QNAP Qutscloud
QNAP Quts Hero
QNAP Systems Inc. Qts — versions unspecified
QNAP Systems Inc. Qutscloud — versions unspecified
QNAP Systems Inc. Quts Hero — versions unspecified

Weakness classification (CWE)

CWE-1021 — Improper Restriction of Rendered UI Layers or Frames (Clickjacking)

References

www.qnap.com/en/security-advisory/qsa-21-03 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-19957?: CVE-2018-19957 is a medium-severity vulnerability in QNAP Qts, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 6.1/10. Published 2021-09-10.
How severe is CVE-2018-19957?: Medium severity. CVSS v3 base score is 6.1 out of 10.