What it is
CVE-2018-19943 is a vulnerability affecting QNAP Systems Inc. QTS. If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed these issues in...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2018-19943
QTS Cross-Site Scripting
QNAP Systems Inc. / QTS · affected before 4.4.2.1270
- Severity
- CVSS 8.0 · High
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 17.7%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
QNAP Systems Inc. / QTS affected before 4.4.2.1270.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code
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
Vendor
Product
Affected
Status
QNAP Systems Inc.
QTS
Before 4.4.2.1270
Affected
QNAP Systems Inc.
QTS
Before 4.4.1.1261
Affected
QNAP Systems Inc.
QTS
Before 4.3.6.1263
Affected
QNAP Systems Inc.
QTS
Before 4.3.4.1282
Affected
QNAP Systems Inc.
QTS
Before 4.3.3.1252
Affected
QNAP Systems Inc.
QTS
Before 4.2.6
Affected
- Published
- 28 Oct 2020
- Exploitation Reported
- 24 May 2022
- Attack vector
- Remote
- Complexity
- High
- Privileges
- Low
- User interaction
- Required
Tags
cisa
windows
malware
ransomware
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2018-19943
- qnap.com/zh-tw/security-advisory/qsa-20-01 qnap.com · CVE Record https://www.qnap.com/zh-tw/security-advisory/qsa-20-01
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
Independent exploitation attestation added to the KEV Intelligence record.
Used in malware
CISA
Malware families have been linked to exploitation of this CVE.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-05-24 00:00 UTC |
| CVE | 2026-08-13 04:20 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
8.0
High
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
EPSS
17.7%
All CVSS Scores
CVSS v3.1
8.0
High
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
CVSS v2.0
3.5
Low
AV:N/AC:M/Au:S/C:N/I:P/A:N
Timeline
From disclosure to observed exploitation
-
KEV confirmed by CVE
Exploitation attested by an external source
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
First public exploitation report
Exploit observed in malware
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2018-19943
Free JSON includes basic KEV fields{
"cve_id": "CVE-2018-19943",
"confidence": "Confirmed",
"cvss_score": 8.0,
"cvss_estimated": false,
"epss_score": 0.17705,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.