CVE-2018-19949 — If exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands

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CRITICAL KEV

If exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands

Published Oct 28, 2020 ·Due Jun 14, 2022

9.8

CRITICAL

CVSS 3.1

EPSS 28.42%

Description

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 products

Vendor QNAP Systems Inc. Product QTS Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <4.2.6
- Version
  unspecified
  Status
  affected
  Constraints
  <4.3.3.1161
- Version
  unspecified
  Status
  affected
  Constraints
  <4.3.4.1190
- Version
  unspecified
  Status
  affected
  Constraints
  <4.3.6.1218
- Version
  unspecified
  Status
  affected
  Constraints
  <4.4.1.1201
- Version
  unspecified
  Status
  affected
  Constraints
  <4.4.2.1231

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

QNAP Systems Inc.

QTS

n/a

Version	Status	Constraints
unspecified	affected	<4.2.6
unspecified	affected	<4.3.3.1161
unspecified	affected	<4.3.4.1190
unspecified	affected	<4.3.6.1218
unspecified	affected	<4.4.1.1201
unspecified	affected	<4.4.2.1231

Remediation

No remediation recorded yet.

Metrics

28.42% 0.28421

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.28421

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (26 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	28.42% (0.28421)	98.07th	v5 (v2026.06.15)
Jun 15, 2026	24.45% (0.24449)	97.59th	v5 (v2026.06.15)
Nov 21, 2025	44.17% (0.44166)	97.39th	v4 (v2025.03.14)
Nov 18, 2025	28.34% (0.28342)	96.22th	v4 (v2025.03.14)
Nov 4, 2025	44.17% (0.44166)	97.39th	v4 (v2025.03.14)
Sep 30, 2025	49.21% (0.49207)	97.72th	v4 (v2025.03.14)
Sep 25, 2025	54.29% (0.54287)	97.95th	v4 (v2025.03.14)
Jun 8, 2025	57.62% (0.57621)	98.01th	v4 (v2025.03.14)
May 28, 2025	66.55% (0.66545)	98.41th	v4 (v2025.03.14)
Mar 30, 2025	69.23% (0.69234)	98.53th	v4 (v2025.03.14)
Mar 29, 2025	75.05% (0.75051)	98.53th	v4 (v2025.03.14)
Mar 17, 2025	69.23% (0.69234)	98.54th	v4 (v2025.03.14)
Jul 20, 2024	0.67% (0.00672)	80.03th	v3 (v2023.03.01)
Feb 8, 2024	0.67% (0.00672)	79.18th	v3 (v2023.03.01)
Jul 14, 2023	0.67% (0.00672)	77.11th	v3 (v2023.03.01)
Jun 4, 2023	0.60% (0.00597)	75.31th	v3 (v2023.03.01)
Mar 16, 2023	0.72% (0.00719)	77.57th	v3 (v2023.03.01)
Mar 7, 2023	0.66% (0.00656)	76.31th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Sep 17, 2022	1.05% (0.01055)	50.47th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Feb 4, 2022	1.05% (0.01055)	27.52th	v2 (v2022.01.01)
Feb 3, 2022	0.52% (0.00523)	12.55th	v1
Jan 6, 2022	0.52% (0.00523)	12.10th	v1
Sep 1, 2021	0.52% (0.00523)	32.27th	v1
Apr 14, 2021	0.52% (0.00523)	0.00th	v1

Weaknesses (3)

CWE-20

Improper Input Validation

CWE-77

CWE-78

OS Command Injection

References (2)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19949
government-resourceUS Government Resource
https://www.qnap.com/zh-tw/security-advisory/qsa-20-01
x_refsource_MISCVendor Advisory

Link	Providers	Tags
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19949		government-resourceUS Government Resource
https://www.qnap.com/zh-tw/security-advisory/qsa-20-01		x_refsource_MISCVendor Advisory