CVE-2021-36742

CRITICALNVD 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%CVSS: 7.8Exploit: cisa kev · ssvc activeExposed: 0

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

A improper input validation vulnerability in Trend Micro Apex One, Apex One as a Service, OfficeScan XG and Worry-Free Business Security 10.0 SP1 allows a local attacker to escalate privileges on affected installations. Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

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 PROB
1%
EPSS %ILE
73%
KEV
⚠ Exploited

Published

July 29, 2021

Last Modified

October 31, 2025

Advisory Details (3)

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-2021-36742
generic

Article unavailable

https://success.trendmicro.com/solution/000287820
generic

Article unavailable

https://success.trendmicro.com/solution/000287819

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 57× in last 7d / 242× 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 918 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-36742?
CVE-2021-36742 is a critical vulnerability published on July 29, 2021. A improper input validation vulnerability in Trend Micro Apex One, Apex One as a Service, OfficeScan XG and Worry-Free Business Security 10.0 SP1 allows a local attacker to escalate privileges on affected installations. Please note: an attacker must first obtain the ability to execute…
When was CVE-2021-36742 disclosed?
CVE-2021-36742 was first published in the National Vulnerability Database on July 29, 2021, 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-2021-36742 actively exploited?
Yes. CISA added CVE-2021-36742 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Trend Micro Apex One, Apex One as a Service, 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-2021-36742?
CVE-2021-36742 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-2021-36742?
CVE-2021-36742 affects Trend Micro Apex One, Apex One as a Service, 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-2021-36742?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-36742, 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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