Home/CVE/QNAP NAS File Station Command Injection Vulnerability
CVE

CVE-2018-19949

QNAP NAS File Station Command Injection Vulnerability

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.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.44166 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 2% of all CVEs by exploitation likelihood
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-20Improper Input Validation
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
▤

Affected Products & Versions

7
qnap qts< 4.2.6
qnap qts>= 4.3.1.0013 and < 4.3.3.1161
qnap qts>= 4.3.4 and < 4.3.4.1190
qnap qts>= 4.3.6 and < 4.3.6.1218
qnap qts>= 4.4.0 and < 4.4.1.1201
qnap qts>= 4.4.2 and < 4.4.2.1231
qnap qtsall versions
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · security@qnapsecurity.com.tw
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 Oct 2020 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2018-19949
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.qnap.com/zh-tw/security-advisory/qsa-20-01Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19949US Government Resource
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