CVE Record
[ CRITICAL ]CVE-2020-2509
QNAP Network-Attached Storage (NAS) Command Injection Vulnerability
QNAP NAS devices contain a command injection vulnerability which could allow attackers to perform remote code execution.
- Vendor
- QNAP
- Product
- QNAP Network-Attached Storage (NAS)
- CVSS
- 9.8
- EPSS (exploit probability)
- 34.0%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2020-2509 being exploited?
Yes. CISA added CVE-2020-2509 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 34.0% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other QNAP Network Attached Storage (NAS) CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2018-19953 QNAP NAS File Station Cross-Site Scripting Vulnerabilityransomware use | [ MEDIUM ] | 6.1 | 29.0% | |
| CVE-2018-19949 QNAP NAS File Station Command Injection Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 28.6% | |
| CVE-2018-19943 QNAP NAS File Station Cross-Site Scripting Vulnerabilityransomware use | [ HIGH ] | 8.0 | 21.5% | |
| CVE-2021-28799 QNAP NAS Improper Authorization Vulnerabilityransomware use | [ CRITICAL ] | 10.0 | 78.3% |