CVE-2020-2509

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-04-11), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 33%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
33%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

April 17, 2021

Last Modified

October 27, 2025

Advisory Details (2)

Auto-updated Jul 28, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-2509
generic

Command Injection Vulnerability in QTS and QuTS hero - Security Advisory | QNAP

https://www.qnap.com/en/security-advisory/qsa-21-05

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 41× in last 7d / 219× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 441 total refreshes for this CVE.

  1. 2026-07-28 05:12 UTCGHSA enrichment
  2. 2026-07-28 01:16 UTCGHSA enrichment
  3. 2026-07-27 21:21 UTCGHSA enrichment
  4. 2026-07-27 19:24 UTCCISA KEV update
  5. 2026-07-27 17:24 UTCGHSA enrichment
  6. 2026-07-27 17:17 UTCCISA KEV update
  7. 2026-07-27 13:29 UTCGHSA enrichment
  8. 2026-07-27 09:35 UTCGHSA enrichment
  9. 2026-07-27 05:40 UTCGHSA enrichment
  10. 2026-07-27 01:45 UTCGHSA enrichment
  11. 2026-07-26 21:50 UTCGHSA enrichment
  12. 2026-07-26 17:56 UTCEG score recompute
  13. 2026-07-26 17:55 UTCGHSA enrichment
  14. 2026-07-26 14:51 UTCEPSS rescore
  15. 2026-07-26 14:01 UTCEG score recompute
  16. 2026-07-26 14:01 UTCGHSA enrichment
  17. 2026-07-26 10:06 UTCGHSA enrichment
  18. 2026-07-26 06:09 UTCGHSA enrichment
  19. 2026-07-26 02:11 UTCEG score recompute
  20. 2026-07-26 02:11 UTCGHSA enrichment
  21. 2026-07-25 14:15 UTCEPSS rescore
  22. 2026-07-24 14:14 UTCEPSS rescore
  23. 2026-07-23 14:15 UTCEPSS rescore
  24. 2026-07-23 14:15 UTCEPSS rescore
  25. 2026-07-23 01:51 UTCEG score recompute
Show 75 more
  1. 2026-07-22 23:40 UTCEG score recompute
  2. 2026-07-22 23:40 UTCGHSA enrichment
  3. 2026-07-22 22:37 UTCEG score recompute
  4. 2026-07-22 19:44 UTCGHSA enrichment
  5. 2026-07-22 19:40 UTCCISA KEV update
  6. 2026-07-22 15:49 UTCEG score recompute
  7. 2026-07-22 15:49 UTCGHSA enrichment
  8. 2026-07-22 14:05 UTCEPSS rescore
  9. 2026-07-22 11:53 UTCGHSA enrichment
  10. 2026-07-22 07:59 UTCGHSA enrichment
  11. 2026-07-22 04:03 UTCGHSA enrichment
  12. 2026-07-22 00:06 UTCGHSA enrichment
  13. 2026-07-21 18:33 UTCGHSA enrichment
  14. 2026-07-21 14:37 UTCGHSA enrichment
  15. 2026-07-21 14:37 UTCCISA KEV update
  16. 2026-07-21 10:42 UTCGHSA enrichment
  17. 2026-07-21 06:46 UTCGHSA enrichment
  18. 2026-07-21 02:50 UTCGHSA enrichment
  19. 2026-07-20 22:54 UTCGHSA enrichment
  20. 2026-07-20 19:00 UTCEG score recompute
  21. 2026-07-20 19:00 UTCGHSA enrichment
  22. 2026-07-20 17:04 UTCEPSS rescore
  23. 2026-07-20 17:04 UTCEPSS rescore
  24. 2026-07-20 15:05 UTCGHSA enrichment
  25. 2026-07-20 11:07 UTCGHSA enrichment
  26. 2026-07-20 07:12 UTCGHSA enrichment
  27. 2026-07-20 03:17 UTCGHSA enrichment
  28. 2026-07-19 23:22 UTCGHSA enrichment
  29. 2026-07-19 19:27 UTCGHSA enrichment
  30. 2026-07-19 15:32 UTCGHSA enrichment
  31. 2026-07-19 11:37 UTCGHSA enrichment
  32. 2026-07-19 07:42 UTCGHSA enrichment
  33. 2026-07-19 03:47 UTCEG score recompute
  34. 2026-07-19 03:47 UTCGHSA enrichment
  35. 2026-07-19 02:26 UTCEPSS rescore
  36. 2026-07-19 02:26 UTCEPSS rescore
  37. 2026-07-18 23:52 UTCGHSA enrichment
  38. 2026-07-18 19:56 UTCGHSA enrichment
  39. 2026-07-18 16:01 UTCGHSA enrichment
  40. 2026-07-18 12:06 UTCEG score recompute
  41. 2026-07-18 12:06 UTCGHSA enrichment
  42. 2026-07-18 08:11 UTCGHSA enrichment
  43. 2026-07-18 04:16 UTCGHSA enrichment
  44. 2026-07-18 00:20 UTCGHSA enrichment
  45. 2026-07-17 20:24 UTCGHSA enrichment
  46. 2026-07-17 16:29 UTCGHSA enrichment
  47. 2026-07-17 12:34 UTCGHSA enrichment
  48. 2026-07-17 08:39 UTCEG score recompute
  49. 2026-07-17 08:39 UTCGHSA enrichment
  50. 2026-07-17 04:44 UTCGHSA enrichment
  51. 2026-07-17 00:49 UTCGHSA enrichment
  52. 2026-07-16 20:55 UTCGHSA enrichment
  53. 2026-07-16 17:04 UTCCISA KEV update
  54. 2026-07-16 17:00 UTCGHSA enrichment
  55. 2026-07-16 16:59 UTCEPSS rescore
  56. 2026-07-16 13:05 UTCGHSA enrichment
  57. 2026-07-16 09:10 UTCGHSA enrichment
  58. 2026-07-16 05:15 UTCGHSA enrichment
  59. 2026-07-16 01:21 UTCGHSA enrichment
  60. 2026-07-15 21:26 UTCGHSA enrichment
  61. 2026-07-15 17:31 UTCGHSA enrichment
  62. 2026-07-15 16:55 UTCEPSS rescore
  63. 2026-07-15 16:55 UTCEPSS rescore
  64. 2026-07-15 16:49 UTCCISA KEV update
  65. 2026-07-15 15:04 UTCCISA KEV update
  66. 2026-07-15 13:35 UTCGHSA enrichment
  67. 2026-07-15 09:40 UTCGHSA enrichment
  68. 2026-07-15 05:44 UTCGHSA enrichment
  69. 2026-07-15 01:48 UTCGHSA enrichment
  70. 2026-07-14 21:53 UTCGHSA enrichment
  71. 2026-07-14 18:05 UTCCISA KEV update
  72. 2026-07-14 17:58 UTCGHSA enrichment
  73. 2026-07-14 14:02 UTCGHSA enrichment
  74. 2026-07-14 10:08 UTCGHSA enrichment
  75. 2026-07-14 06:13 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCjbaines-r7/overkill
    First seen Jul 27, 2022

    QNAP N-Day (Probably not CVE-2020-2509)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2020-2509?
CVE-2020-2509 is a critical vulnerability published on April 17, 2021. 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…
When was CVE-2020-2509 disclosed?
CVE-2020-2509 was first published in the National Vulnerability Database on April 17, 2021, with the most recent update on October 27, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-2509 actively exploited?
Yes. CISA added CVE-2020-2509 to the Known Exploited Vulnerabilities catalog on April 11, 2022, affecting QNAP QNAP Network-Attached Storage (NAS). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-2509?
CVE-2020-2509 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2020-2509?
CVE-2020-2509 affects QNAP QNAP Network-Attached Storage (NAS). The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2020-2509?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-2509, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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