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CVE-2018-19943

QNAP NAS File Station Cross-Site Scripting

8.0 HIGHActively exploited (CISA KEV)Used in ransomwareEPSS 21.5%
  1. Published28 Oct 2020
  2. Added to CISA KEV24 May 2022
  3. Remediation due14 Jun 2022
Actively exploited (CISA KEV)

A cross-site scripting vulnerability affecting QNAP NAS File Station could allow remote attackers to inject malicious code.

Added to KEV: 24 May 2022Federal remediation due: 14 Jun 2022Used in ransomware

Description

If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed these issues in the following QTS versions. QTS 4.4.2.1270 build 20200410 and later QTS 4.4.1.1261 build 20200330 and later QTS 4.3.6.1263 build 20200330 and later QTS 4.3.4.1282 build 20200408 and later QTS 4.3.3.1252 build 20200409 and later QTS 4.2.6 build 20200421 and later

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredLow
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

QNAP Qts≥ 4.3.1.0013 < 4.3.3.1252 · ≥ 4.3.4 < 4.3.4.1282 · ≥ 4.3.6 < 4.3.6.1263 · ≥ 4.4.0 < 4.4.1.1261

Remediation

Fixed in
QNAP Qts≥ 4.3.3.1252

References

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Frequently asked

Is CVE-2018-19943 being actively exploited?

Yes. CVE-2018-19943 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 24 May 2022. It has been used in ransomware campaigns.

How severe is CVE-2018-19943?

CVE-2018-19943 has a CVSS 3.1 base score of 8.0, rated high. EPSS estimates a 21.5% probability of exploitation.

Which products are affected by CVE-2018-19943?

Affected products include QNAP Qts.

How do I fix CVE-2018-19943?

Upgrade affected software to a fixed version, for example QNAP Qts 4.3.3.1252 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2018-19943 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.