CVE-2018-20753

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 2022-04-13), 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: 29%CVSS: 9.8Exploit: cisa kev · ssvc active · kev ransomware · epss top5pctExposed: 0

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

Kaseya VSA RMM before R9.3 9.3.0.35, R9.4 before 9.4.0.36, and R9.5 before 9.5.0.5 allows unprivileged remote attackers to execute PowerShell payloads on all managed devices. In January 2018, attackers actively exploited this vulnerability in the wild.

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
29%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

February 5, 2019

Last Modified

August 13, 2026

Advisory Details (2)

Auto-updated Aug 20, 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-2018-20753
generic

Deep Dive: Kaseya VSA Mining Payload | Huntress

https://blog.huntresslabs.com/deep-dive-kaseya-vsa-mining-payload-c0ac839a0e88

Data Freshness Timeline

(refreshed 62× in last 7d / 240× 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 686 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2018-20753?
CVE-2018-20753 is a critical vulnerability published on February 5, 2019. Kaseya VSA RMM before R9.3 9.3.0.35, R9.4 before 9.4.0.36, and R9.5 before 9.5.0.5 allows unprivileged remote attackers to execute PowerShell payloads on all managed devices. In January 2018, attackers actively exploited this vulnerability in the wild.
When was CVE-2018-20753 disclosed?
CVE-2018-20753 was first published in the National Vulnerability Database on February 5, 2019, with the most recent update on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-20753 actively exploited?
Yes. CISA added CVE-2018-20753 to the Known Exploited Vulnerabilities catalog on April 13, 2022, affecting Kaseya Virtual System/Server Administrator (VSA). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-20753?
CVE-2018-20753 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2018-20753?
CVE-2018-20753 affects Kaseya Virtual System/Server Administrator (VSA). 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-2018-20753?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20753, 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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