CVE-2018-19957: Insufficient HTTP Security Headers in QTS, QuTS hero, and QuTScloud

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-09-10 · updated 2026-06-17
Weakness: CWE-1021

Description

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

Affected products

QNAP QTS: before 4.5.4.1715 — fixed in 4.5.4.1715
QNAP Systems Inc. QuTS hero: before h4.5.4.1771 — fixed in h4.5.4.1771
QNAP Systems Inc. QuTScloud: before c4.5.6.1755 — fixed in c4.5.6.1755

How to fix

Upgrade to a fixed version: QNAP QTS 4.5.4.1715; QNAP Systems Inc. QuTS hero h4.5.4.1771; QNAP Systems Inc. QuTScloud c4.5.6.1755. Check the vendor advisory for mitigations.

References

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