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CVE-2018-19943

MEDIUM
5.4
CVSS Score
Published: October 28, 2020 at 05:55 PM UTC
Updated: August 13, 2026 at 05:37 AM UTC
1 product affected across 1 vendorQTS

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Severity
MEDIUM5.4
Exploitation
CISA KEV
Exploit prediction
EPSS 23%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score22.7%

EPSS (Exploit Prediction Scoring System) estimates a 22.7% chance this CVE is exploited in the wild within the next 30 days — higher than 98% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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

Required Action
Apply updates per vendor instructions.
Ransomware Use
Known
Added to KEV
May 24, 2022
Remediation Due
Jun 14, 2022
1596 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2018-19943

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

QTS· Qnap
95%
v < 4.2.6v < 4.3.3.1252v < 4.3.4.1282v < 4.3.6.1263v < 4.4.1.1261v < 4.4.2.12704.3.1.0013 ≤ v < 4.3.3.12524.3.4 ≤ v < 4.3.4.12824.3.6 ≤ v < 4.3.6.12634.4.0 ≤ v < 4.4.1.12614.4.2 ≤ v < 4.4.2.12704.2.64.2.6 build_201705174.2.6 build_201903224.2.6 build_201907304.2.6 build_201909214.2.6 build_201911074.2.6 build_202001094.2.6 build_202004214.2.6 build_202006114.2.6 build_20200821
Affected range stops below 4.2.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.3.1252, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.4.1282, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.6.1263, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.4.1.1261, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.4.2.1270, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.qnap.com/zh-tw/security-advisory/qsa-20-01
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19943

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79CWE-80

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