How severe is CVE-2018-19942?

CVE-2018-19942 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-19942 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-19942?

CVE-2018-19942 primarily affects Qnap Qts. In total, 105 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-19942?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-19942 published?

CVE-2018-19942 was published on 2021-04-16 and last updated on 2026-06-17.

CVE-2018-19942

CVE-2018-19942 is a medium-severity vulnerability in Qnap Qts with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Qnap Qts
Published: 2021-04-16
Last modified: 2026-06-17

Description

A cross-site scripting (XSS) vulnerability has been reported to affect earlier versions of File Station. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions: QTS 4.5.2.1566 build 20210202 (and later) QTS 4.5.1.1456 build 20201015 (and later) QTS 4.3.6.1446 build 20200929 (and later) QTS 4.3.4.1463 build 20201006 (and later) QTS 4.3.3.1432 build 20201006 (and later) QTS 4.2.6 build 20210327 (and later) QuTS hero h4.5.1.1472 build 20201031 (and later) QuTScloud c4.5.4.1601 build 20210309 (and later) QuTScloud c4.5.3.1454 build 20201013 (and later)

Frequently asked questions

What is CVE-2018-19942?: A cross-site scripting (XSS) vulnerability has been reported to affect earlier versions of File Station. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions: QTS 4.5.2.1566 build 20210202 (and later) QTS 4.5.1.1456 build 20201015 (and later) QTS 4.3.6.1446 build 20200929 (and later) QTS 4.3.4.1463 build 20201006 (and later) QTS 4.3.3.1432 build 20201006 (and later) QTS 4.2.6 build 20210327 (and later) QuTS hero h4.5.1.1472 build 20201031 (and later) QuTScloud c4.5.4.1601 build 20210309 (and later) QuTScloud c4.5.3.1454 build 20201013 (and later)
How severe is CVE-2018-19942?: CVE-2018-19942 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-19942 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-19942?: CVE-2018-19942 primarily affects Qnap Qts. In total, 105 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-19942?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-19942 published?: CVE-2018-19942 was published on 2021-04-16 and last updated on 2026-06-17.

References

https://www.qnap.com/zh-tw/security-advisory/qsa-21-04

Affected products (105)

cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.2.6:-:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.2.6:build_20170517:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.2.6:build_20190322:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.2.6:build_20190730:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.2.6:build_20190921:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.2.6:build_20191107:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.2.6:build_20200109:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.2.6:build_20200421:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.2.6:build_20200611:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.2.6:build_20200821:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0095:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0096:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0136:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0154:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0174:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0188:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0210:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0229:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0238:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0262:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0299:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0351:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0353:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0361:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0369:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0378:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0396:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0404:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0416:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0418:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0448:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0514:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0546:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0570:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0868:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.0998:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.1051:*:*:*:*:*:*:*
cpe:2.3:o:qnap:qts:4.3.3.1098:*:*:*:*:*:*:*

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