CVE-2020-8599

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 2021-11-03), 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: 12%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pctExposed: 0

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

Trend Micro Apex One (2019) and OfficeScan XG server contain a vulnerable EXE file that could allow a remote attacker to write arbitrary data to an arbitrary path on affected installations and bypass ROOT login. Authentication is not required to exploit this vulnerability.

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
12%
EPSS %ILE
96%
KEV
⚠ Exploited

Published

March 18, 2020

Last Modified

October 31, 2025

Advisory Details (2)

Auto-updated Sep 17, 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-2020-8599
generic

Article unavailable

https://success.trendmicro.com/solution/000245571

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 61× in last 7d / 258× 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 946 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2020-8599?
CVE-2020-8599 is a critical vulnerability published on March 18, 2020. Trend Micro Apex One (2019) and OfficeScan XG server contain a vulnerable EXE file that could allow a remote attacker to write arbitrary data to an arbitrary path on affected installations and bypass ROOT login. Authentication is not required to exploit this vulnerability.
When was CVE-2020-8599 disclosed?
CVE-2020-8599 was first published in the National Vulnerability Database on March 18, 2020, with the most recent update on October 31, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-8599 actively exploited?
Yes. CISA added CVE-2020-8599 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Trend Micro Apex One and OfficeScan. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-8599?
CVE-2020-8599 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2020-8599?
CVE-2020-8599 affects Trend Micro Apex One and OfficeScan. 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-2020-8599?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-8599, 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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