CVE-2018-19957Network attack vector

Browser-mediated disclosure and modification via missing headers

Published Sep 10, 2021 · Updated Sep 17, 2024

Insufficient HTTP security headers in QNAP QTS, QuTS hero, and QuTScloud allow remote attackers to launch browser-based privacy attacks. QNAP has not identified which response headers are missing or which web-interface responses omit them. Exploitation requires user interaction with attacker-controlled content, and the reported impact is limited to browser-mediated disclosure or modification.

CVSS severity6.1
Medium
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient HTTP security headers in QNAP QTS, QuTS hero, and QuTScloud allow remote attackers to launch browser-based privacy attacks. QNAP has not identified which response headers are missing or which web-interface responses omit them. Exploitation requires user interaction with attacker-controlled content, and the reported impact is limited to browser-mediated disclosure or modification.

The record

CVE
CVE-2018-19957
Published
Sep 10, 2021
Updated
Sep 17, 2024
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-1021
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <h4.5.4.1771 build 20210825

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=unspecified <h4.5.4.1771 build 20210825
Linn Products Limited · QuTScloudversion=unspecified <c4.5.6.1755 build 20210809
Linn Products Limited · QTSversion=unspecified <4.5.4.1715 build 20210630

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1021Improper Restriction of Rendered UI Layers or Frames

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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