CVE-2018-19943

HIGHNVD 8.09.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-05-24), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.0 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
8.0
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 18%CVSS: 8.0Exploit: NoneExposed: 0

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

If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed these issues in the following QTS versions. QTS 4.4.2.1270 build 20200410 and later QTS 4.4.1.1261 build 20200330 and later QTS 4.3.6.1263 build 20200330 and later QTS 4.3.4.1282 build 20200408 and later QTS 4.3.3.1252 build 20200409 and later QTS 4.2.6 build 20200421 and later

CVSS v3
8.0
EG Score
9.0(high)
EPSS
96.8%
KEV
⚠ Exploited

Published

October 28, 2020

Last Modified

November 3, 2025

Advisory Details (2)

Auto-updated Jun 3, 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-2018-19943
generic

Multiple Vulnerabilities in File Station - Security Advisory | QNAP

https://www.qnap.com/zh-tw/security-advisory/qsa-20-01

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 96× in last 7d / 412× 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 642 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2018-19943?
CVE-2018-19943 is a high vulnerability published on October 28, 2020. If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed these issues in the following QTS versions. QTS 4.4.2.1270 build 20200410 and later QTS 4.4.1.1261 build 20200330 and later QTS 4.3.6.1263 build 20200330 and later QTS…
When was CVE-2018-19943 disclosed?
CVE-2018-19943 was first published in the National Vulnerability Database on October 28, 2020, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-19943 actively exploited?
Yes. CISA added CVE-2018-19943 to the Known Exploited Vulnerabilities catalog on May 24, 2022, affecting 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-2018-19943?
CVE-2018-19943 has a CVSS v3 base score of 8.0 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2018-19943?
CVE-2018-19943 affects 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-2018-19943?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-19943, 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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