What is CVE-2018-19953?

CVE-2018-19953 is a medium-severity vulnerability in Qnap Qts, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-10-28.

How severe is CVE-2018-19953?

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

Is CVE-2018-19953 known to be exploited?

Yes. CVE-2018-19953 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-24), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

XSS in Qnap Qts

CVE-2018-19953

If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed the issue in the following QTS versions. QTS 4.4.2.1231 on build 20200302; QTS 4.4.1.1201 on build 20200130…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.239 (97.6th percentile) — read the EPSS interpretation.

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.

Affected products

Qnap Qts — versions 4.2.6
Qnap Systems Inc. Qts — versions unspecified

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-05-24. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-06-14.

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

security@qnapsecurity.com.tw (x_refsource_MISC, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2018-19953?: CVE-2018-19953 is a medium-severity vulnerability in Qnap Qts, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-10-28.
How severe is CVE-2018-19953?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2018-19953 known to be exploited?: Yes. CVE-2018-19953 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-24), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.