CVE-2020-2506

CRITICALNVD 7.39.8▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.3 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: 2%CVSS: 7.3Exploit: cisa kev · ssvc activeExposed: 0

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

The vulnerability have been reported to affect earlier versions of QTS. If exploited, this improper access control vulnerability could allow attackers to compromise the security of the software by gaining privileges, or reading sensitive information. This issue affects: QNAP Systems Inc. Helpdesk versions prior to 3.0.3.

CVSS v3
7.3
EG Score
9.8(high)
EG Risk
99(Attend)
EG Risk 99/100SSVC: Attend

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: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
78%
KEV
⚠ Exploited

Published

February 3, 2021

Last Modified

October 27, 2025

Advisory Details (2)

Auto-updated Jun 9, 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-2020-2506
generic

Multiple Vulnerabilities in Helpdesk - Security Advisory | QNAP

https://www.qnap.com/zh-tw/security-advisory/qsa-20-08

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 41× in last 7d / 211× 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 428 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2020-2506?
CVE-2020-2506 is a critical vulnerability published on February 3, 2021. The vulnerability have been reported to affect earlier versions of QTS. If exploited, this improper access control vulnerability could allow attackers to compromise the security of the software by gaining privileges, or reading sensitive information. This issue affects: QNAP Systems Inc. Helpdesk…
When was CVE-2020-2506 disclosed?
CVE-2020-2506 was first published in the National Vulnerability Database on February 3, 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-2020-2506 actively exploited?
Yes. CISA added CVE-2020-2506 to the Known Exploited Vulnerabilities catalog on March 25, 2022, affecting QNAP Systems Helpdesk. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-2506?
CVE-2020-2506 has a CVSS v3 base score of 7.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
Which products are affected by CVE-2020-2506?
CVE-2020-2506 affects QNAP Systems Helpdesk. 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-2020-2506?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-2506, 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.

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