CVE-2020-2509

Command Injection Vulnerability in QTS and QuTS hero

  • Critical 9.8
  • Exploited: added to CISA KEV 11 Apr 2022

Description

A command injection vulnerability has been reported to affect QTS and QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. We have already fixed this vulnerability in the following versions: QTS 4.5.2.1566 Build 20210202 and later QTS 4.5.1.1495 Build 20201123 and later QTS 4.3.6.1620 Build 20210322 and later QTS 4.3.4.1632 Build 20210324 and later QTS 4.3.3.1624 Build 20210416 and later QTS 4.2.6 Build 20210327 and later QuTS hero h4.5.1.1491 build 20201119 and later

Key facts

Published
17 Apr 2021
Last changed
21 Oct 2025
Assigned by
qnap
KEV added
11 Apr 2022
KEV fix due
2 May 2022
EPSS
33.987% likely to be exploited in the next 30 days, higher than 98.423% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.8CVSS 3.1, Criticalfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What to do

  • QNAP has already fixed this vulnerability in the following versions: QTS 4.5.2.1566 Build 20210202 and later QTS 4.5.1.1495 Build 20201123 and later QTS 4.3.6.1620 Build 20210322 and later QTS 4.3.4.1632 Build 20210324 and later QTS 4.3.3.1624 Build 20210416 and later QTS 4.2.6 Build 20210327 and later QuTS hero h4.5.1.1491 build 20201119 and laterCNA solution statement
  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
QNAP Systems Inc.QTS
  • unspecified up to but excluding 4.5.2.1566 Build 20210202 (affected)
  • unspecified up to but excluding 4.5.1.1495 Build 20201123 (affected)
  • unspecified up to but excluding 4.3.6.1620 Build 20210322 (affected)
  • unspecified up to but excluding 4.3.4.1632 Build 20210324 (affected)
  • unspecified up to but excluding 4.3.3.1624 Build 20210416 (affected)
  • unspecified up to but excluding 4.2.6 Build 20210327 (affected)
QNAP Systems Inc.QuTS hero
  • unspecified up to but excluding h4.5.1.1491 build 20201119 (affected)

Timeline

  1. 17 Apr 2021 Published
  2. 11 Apr 2022 CVE-2020-2509 added to CISA KEV
  3. 11 Apr 2022 Added to the CISA KEV catalogue

Weakness

Practice this bug class

HackZoneLabs has a hands-on lab on OS command injection (CWE-78).

References