Exploitation evidence
Known exploited · CISA KEV listed
Added 2022-04-11. Ransomware campaign use: Unknown.
CISA required action: Apply updates per vendor instructions.
CISA due date: 2022-05-02. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
QNAP Systems Inc. / QTS
Default status: Not specified
- affected: unspecified to < 4.5.2.1566 Build 20210202 (custom)
- affected: unspecified to < 4.5.1.1495 Build 20201123 (custom)
- affected: unspecified to < 4.3.6.1620 Build 20210322 (custom)
- affected: unspecified to < 4.3.4.1632 Build 20210324 (custom)
- affected: unspecified to < 4.3.3.1624 Build 20210416 (custom)
- affected: unspecified to < 4.2.6 Build 20210327 (custom)
QNAP Systems Inc. / QuTS hero
Default status: Not specified
- affected: unspecified to < h4.5.1.1491 build 20201119 (custom)
Fixes and workarounds
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 later
Sources and related reporting
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.33987,
"percentile": 0.9842
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.33987,
"percentile": 0.9841
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.33987,
"percentile": 0.98408
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.33987,
"percentile": 0.98407
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.33987,
"percentile": 0.98406
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.33987,
"percentile": 0.98404
}06 Nov 2026, 06:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
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"timestamp": "2025-02-06T20:45:39.459476Z",
"version": "2.0.3"
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"type": "ssvc"
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"other": {
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"cna": {
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{
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{
"lessThan": "4.3.4.1632 Build 20210324",
"status": "affected",
"version": "unspecified",
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{
"lessThan": "4.3.3.1624 Build 20210416",
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{
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],
"problemTypes": [
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}
],
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"discovery": "EXTERNAL"
},
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},
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"TITLE": "Command Injection Vulnerability in QTS and QuTS hero"
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"affects": {
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},
{
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"description": {
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"value": "QNAP has already fixed this vulnerability in the following versions:\nQTS 4.5.2.1566 Build 20210202 and later\nQTS 4.5.1.1495 Build 20201123 and later\nQTS 4.3.6.1620 Build 20210322 and later\nQTS 4.3.4.1632 Build 20210324 and later\nQTS 4.3.3.1624 Build 20210416 and later\nQTS 4.2.6 Build 20210327 and later\nQuTS hero h4.5.1.1491 build 20201119 and later"
}
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},
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"assignerShortName": "qnap",
"cveId": "CVE-2020-2509",
"datePublished": "2021-04-17T03:50:12.655Z",
"dateReserved": "2019-12-09T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:25:49.063Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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}05 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.33987,
"percentile": 0.98402
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.33987,
"percentile": 0.98401
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.33987,
"percentile": 0.98398
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.33987,
"percentile": 0.98396
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2020-2509",
"cwes": [
"CWE-77",
"CWE-78"
],
"dateAdded": "2022-04-11",
"dueDate": "2022-05-02",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://nvd.nist.gov/vuln/detail/CVE-2020-2509",
"product": "QNAP Network-Attached Storage (NAS)",
"requiredAction": "Apply updates per vendor instructions.",
"shortDescription": "QNAP NAS devices contain a command injection vulnerability which could allow attackers to perform remote code execution.",
"vendorProject": "QNAP",
"vulnerabilityName": "QNAP Network-Attached Storage (NAS) Command Injection Vulnerability"
}