CVE-2020-2509: QNAP Network-Attached Storage (NAS) Command Injection Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 359 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 34%
EPSS score, percentile 98.4 of all scored records
- How severe?
- 9.8 Critical
CVSS v3.1 base score, from CISA's enrichment of the record
- What should I do?
CISA deadline . Apply updates per vendor instructions.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- before 4.5.2.1566 Build 20210202
- before 4.5.1.1495 Build 20201123
- before 4.3.6.1620 Build 20210322
- before 4.3.4.1632 Build 20210324
- before 4.3.3.1624 Build 20210416
- before 4.2.6 Build 20210327
and 1 more in the table below
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
What to do
Required action, set by CISA
Apply updates per vendor instructions.
CISA due date for this action: .
Solution (from the CVE record)
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
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | before 4.5.2.1566 Build 20210202 |
| Affected | before 4.5.1.1495 Build 20201123 |
| Affected | before 4.3.6.1620 Build 20210322 |
| Affected | before 4.3.4.1632 Build 20210324 |
| Affected | before 4.3.3.1624 Build 20210416 |
| Affected | before 4.2.6 Build 20210327 |
| Status | Versions |
|---|---|
| Affected | before h4.5.1.1491 build 20201119 |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
About this vulnerability
QNAP NAS devices contain a command injection vulnerability which could allow attackers to perform remote code execution.
Summary: CISA's KEV catalog, as of .
- CISA added CVE-2020-2509 to its Known Exploited Vulnerabilities (KEV) catalog on 11 Apr 2022.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 2 May 2022.
- The CVE record was published on 17 Apr 2021, 359 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), taken from CISA's enrichment of the record.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 34% (percentile 98.4), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.
Description
Command Injection Vulnerability in QTS and QuTS hero
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
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
Weakness
- CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
- CWE-78: OS Command Injection
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| Added to CISA KEV | |
| CISA due date for the required action | |
| CVE record last updated |
References
More exploited QNAP vulnerabilities
- CVE-2023-47565: QNAP VioStor NVR OS Command Injection Vulnerability
- CVE-2022-27593: QNAP Photo Station Externally Controlled Reference Vulnerability
- CVE-2019-7192: QNAP Photo Station Improper Access Control Vulnerability
- CVE-2019-7193: QNAP QTS Improper Input Validation Vulnerability
- CVE-2019-7194: QNAP Photo Station Path Traversal Vulnerability
- CVE-2019-7195: QNAP Photo Station Path Traversal Vulnerability