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ExploitedIn CISA KEVFix available

CVE-2020-2509

Exploitation confirmed. First attested on 2022-04-11 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-04-17
  • Fixed in4.5.1 · 4.3.6 · 4.2.6
  • WeaknessCWE-77 · CWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

Timeline

dates in UTC
  1. 2021-04-1704:15CVE publishedNVD
  2. 2022-04-11Added to the CISA KEV catalogCISA KEV
  3. 2022-04-11Listed as exploited by GCVEGCVE
  4. 2022-04-11Exploitation first reportedCISA KEV
  5. 2025-02-0620:45SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-2509?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-2509?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Qnap qts
BranchAffectedFixed in
4.x≥ 4.4.0, < 4.5.14.5.1
4.3≥ 4.3.5, < 4.3.64.3.6
4.2< 4.2.64.2.6
4.2= 4.2.6no fix published
4.3= 4.3.3.0174no fix published
4.3= 4.3.3.0868no fix published
4.3= 4.3.3.0998no fix published
4.3= 4.3.3.1051no fix published
4.3= 4.3.3.1098no fix published
4.3= 4.3.3.1161no fix published
4.3= 4.3.3.1252no fix published
4.3= 4.3.3.1315no fix published
Qnap quts hero
BranchAffectedFixed in
—< h4.5.1h4.5.1
—= h4.5.1no fix published
—= h4.5.1.1472no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As qnap, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • QNAP Systems Inc. QTS
    Affected
    • < 4.5.2.1566 Build 20210202fixed in 4.5.2.1566 Build 20210202custom
    • < 4.5.1.1495 Build 20201123fixed in 4.5.1.1495 Build 20201123custom
    • < 4.3.6.1620 Build 20210322fixed in 4.3.6.1620 Build 20210322custom
    • < 4.3.4.1632 Build 20210324fixed in 4.3.4.1632 Build 20210324custom
    • < 4.3.3.1624 Build 20210416fixed in 4.3.3.1624 Build 20210416custom
    • < 4.2.6 Build 20210327fixed in 4.2.6 Build 20210327custom
  • QNAP Systems Inc. QuTS hero
    Affected
    • < h4.5.1.1491 build 20201119fixed in h4.5.1.1491 build 20201119custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2024-09-16

Fix

  1. Update Qnap qts to 4.5.1 · 4.3.6 · 4.2.6
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-05-02

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedjbaines-r7/overkill
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-04-11
Patch Due Date
2022-05-02
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-04-17
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-77jf-5mcg-g6m9

Frequently asked questions

What is CVE-2020-2509?

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

Is CVE-2020-2509 actively exploited?

Yes. CVE-2020-2509 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-02.

What is the CVSS score for CVE-2020-2509?

CVE-2020-2509 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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