CVE-2020-2509

highpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.340 · 98 %ileexploit · PoCEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 1 exploit · PoC

Likely / severe?

34.0% (98th) EPSS

CVSS 7.5 · high

Is it mine?

86 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

added 2022-04-11remediate by 2022-05-02

required action Apply updates per vendor instructions.

EPSS · scored 2026-10-27

QNAP Network-Attached Storage (NAS) Command Injection Vulnerability

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

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-77USprimaryCWE-77USCWE-78USCWE-78US

exploits (1)

Public proof-of-concept and weaponised exploit code.

jbaines-r7/overkillQNAP N-Day (Probably not CVE-2020-2509)PoC · poc_in_github

affected products (86)

Products and version ranges known to be affected.

QNAP Systems Inc. QTSunspecified → 4.2.6 Build 20210327enisa_euvdEU
QNAP Systems Inc. QTSunspecified → 4.3.3.1624 Build 20210416enisa_euvdEU
QNAP Systems Inc. QTSunspecified → 4.3.4.1632 Build 20210324enisa_euvdEU
QNAP Systems Inc. QTSunspecified → 4.3.6.1620 Build 20210322enisa_euvdEU
QNAP Systems Inc. QTSunspecified → 4.5.1.1495 Build 20201123enisa_euvdEU
QNAP Systems Inc. QTSunspecified → 4.5.2.1566 Build 20210202enisa_euvdEU
QNAP Systems Inc. QuTS herounspecified → h4.5.1.1491 build 20201119enisa_euvdEU
QNAP Systems, Inc. QTS≤ 4.2.6 Build 20210327fstec_bduRU
QNAP Systems, Inc. QTS≤ 4.3.3.1624 Build 20210416fstec_bduRU
QNAP Systems, Inc. QTS≤ 4.3.6.1620 Build 20210322fstec_bduRU
QNAP Systems, Inc. QTS≤ 4.5.2.1566 Build 20210202fstec_bduRU
QNAP Systems, Inc. QTS≤ 4.5.1.1495 Build 20201123fstec_bduRU
QNAP Systems, Inc. QTS≤ 4.3.4.1632 Build 20210324fstec_bduRU
QNAP Systems, Inc. QuTS hero≤ h4.5.1.1491 build 20201119fstec_bduRU
qnap qts< 4.2.6nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
qnap qts= 4.2.6nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
qnap qts= 4.3.3.0174nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
qnap qts= 4.3.3.0868nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
qnap qts= 4.3.3.0998nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
qnap qts= 4.3.3.1051nvdUScpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*

showing 20 of 86

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2021-04-17modified 2026-06-17

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+4594 more

references (6)

External citations — patches, advisories, analysis.

scry

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