CVE-2020-24557

HIGHNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 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 7.8 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
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 3%CVSS: 7.8Exploit: NoneExposed: 0

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

A vulnerability in Trend Micro Apex One and Worry-Free Business Security 10.0 SP1 on Microsoft Windows may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function and attain privilege escalation. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. Please note that version 1909 (OS Build 18363.719) of Microsoft Windows 10 mitigates hard links, but previous versions are affected.

CVSS v3
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: 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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
84.0%
KEV
⚠ Exploited

Published

September 1, 2020

Last Modified

October 31, 2025

Advisory Details (4)

Auto-updated Jun 4, 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-2020-24557
generic

ZDI-20-1094 | Zero Day Initiative

https://www.zerodayinitiative.com/advisories/ZDI-20-1094/
generic

Article unavailable

https://success.trendmicro.com/solution/000267260
generic

Article unavailable

https://success.trendmicro.com/solution/000263632

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 55× 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 454 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2020-24557?
CVE-2020-24557 is a high vulnerability published on September 1, 2020. A vulnerability in Trend Micro Apex One and Worry-Free Business Security 10.0 SP1 on Microsoft Windows may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function and attain privilege escalation. An attacker must first…
When was CVE-2020-24557 disclosed?
CVE-2020-24557 was first published in the National Vulnerability Database on September 1, 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-2020-24557 actively exploited?
Yes. CISA added CVE-2020-24557 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Trend Micro Apex One, OfficeScan, and Worry-Free Business Security. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-24557?
CVE-2020-24557 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2020-24557?
CVE-2020-24557 affects Trend Micro Apex One, OfficeScan, and Worry-Free Business Security. 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-2020-24557?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-24557, 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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