CVE-2018-19949 QNAP NAS File Station Command Injection Vulnerability
A command injection vulnerability affecting QNAP NAS File Station could allow remote attackers to run commands.
From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.
Should You Worry?
- CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 24 May 2022.
- CISA lists it as known to be used in ransomware campaigns.
- Rated Critical severity (CVSS 9.8, scored by CISA).
- It has been in the catalogue for 1,627 days. Systems still unpatched now have almost certainly been scanned for it.
What It Is
If exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands. 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; QTS 4.3.6.1218 on build 20200214; QTS 4.3.4.1190 on build 20200107; QTS 4.3.3.1161 on build 20200109; QTS 4.2.6 on build 20200109.
Affected Versions
| Product | Versions |
|---|---|
| QNAP Systems Inc. QTS | unspecified to before 4.4.2.1231 |
| QNAP Systems Inc. QTS | unspecified to before 4.4.1.1201 |
| QNAP Systems Inc. QTS | unspecified to before 4.3.6.1218 |
| QNAP Systems Inc. QTS | unspecified to before 4.3.4.1190 |
| QNAP Systems Inc. QTS | unspecified to before 4.3.3.1161 unspecified to before 4.2.6 |
From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.
What To Do Now
- 1
Find it
Search your asset inventory and external attack surface for QNAP Network Attached Storage (NAS). Include cloud images, appliances and anything a supplier runs for you.
Attack Surface Management - 2
- 3
Hunt for compromise
If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.
Incident Response - 4
Prove it is fixed
Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.
Penetration Testing
Vendor Advisories
The Compliance Clock
General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.
Not Sure If You Are Exposed?
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