CVE-2018-19943

Summary

CVE	CVE-2018-19943
State	PUBLISHED
Assigner	qnap
Source Priority	CVE Program / NVD first with legacy fallback
Published	2020-10-28 18:15:12 UTC
Updated	2026-08-13 05:17:17 UTC
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

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.177050000 probability, percentile 0.969200000 (date 2026-08-22)

CISA KEV: Listed on 2022-05-24; due 2022-06-14; ransomware use Known

Problem Types: CWE-79 | CWE-80 | CWE-79 CWE-79 Cross-site Scripting (XSS) | CWE-80 CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	5.4	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`
3.1	[email protected]	Secondary	8	HIGH	`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H`
3.1	CNA	DECLARED	8	HIGH	`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H`
2.0	[email protected]	Primary	3.5		`AV:N/AC:M/Au:S/C:N/I:P/A:N`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS v2.0 Breakdown

Access Vector

Network

Access Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

Partial

Availability

None

AV:N/AC:M/Au:S/C:N/I:P/A:N

CISA Known Exploited Vulnerability

Vendor	QNAP
Product	Network Attached Storage (NAS)
Name	QNAP NAS File Station Cross-Site Scripting Vulnerability
Required Action	Apply updates per vendor instructions.
Notes	https://nvd.nist.gov/vuln/detail/CVE-2018-19943

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Qnap	Qts	All	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	QNAP Systems Inc.	QTS	affected unspecified 4.4.2.1270 custom	build 20200410
CNA	QNAP Systems Inc.	QTS	affected unspecified 4.4.1.1261 custom	build 20200330
CNA	QNAP Systems Inc.	QTS	affected unspecified 4.3.6.1263 custom	build 20200330
CNA	QNAP Systems Inc.	QTS	affected unspecified 4.3.4.1282 custom	build 20200408
CNA	QNAP Systems Inc.	QTS	affected unspecified 4.3.3.1252 custom	build 20200409
CNA	QNAP Systems Inc.	QTS	affected unspecified 4.2.6 custom	build 20200421

References

Reference	Source	Link	Tags
Multiple Vulnerabilities in File Station - Security Advisory \| QNAP	af854a3a-2127-422b-91ae-364da2661108	www.qnap.com	Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog	134c704f-9b21-4f2e-91b3-4a467353bcc0	www.cisa.gov	US Government Resource
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis
CISA Known Exploited Vulnerabilities catalog	CISA	www.cisa.gov	kev

Vendor Comments And Credit

Discovery Credit

CNA: Independent Security Evaluators (en)

Additional Advisory Data

Source	Time	Event
ADP	2022-05-24T00:00:00.000Z	CVE-2018-19943 added to CISA KEV

Legacy QID Mappings

731240 QNAP QTS Multiple Security Vulnerabilities (QSA-20-01)