CVE-2020-28578

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 73% (99th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.8EG
EchelonGraph verdictMitigate this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 73%
CISA-KEV: Not listedEPSS PROB: 73%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

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

A vulnerability in Trend Micro InterScan Web Security Virtual Appliance 6.5 SP2 could allow an unauthenticated, remote attacker to send a specially crafted HTTP message and achieve remote code execution with elevated privileges.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
78
EG Risk 78/100CISA SSVC

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%
Exploitation73% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
73%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

November 18, 2020

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Oct 4, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Trend Micro InterScan Web Security Virtual Appliance Multiple Vulnerabilities - Research Advisory | Tenable®

https://www.tenable.com/security/research/tra-2020-63
generic

Article unavailable

https://success.trendmicro.com/solution/000281954

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 3× in last 7d / 16× 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.

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

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Frequently asked(5)

What is CVE-2020-28578?
CVE-2020-28578 is a critical vulnerability published on November 18, 2020. A vulnerability in Trend Micro InterScan Web Security Virtual Appliance 6.5 SP2 could allow an unauthenticated, remote attacker to send a specially crafted HTTP message and achieve remote code execution with elevated privileges.
When was CVE-2020-28578 disclosed?
CVE-2020-28578 was first published on November 18, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-28578 actively exploited?
CVE-2020-28578 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 73% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-28578?
CVE-2020-28578 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-28578?
No fix for CVE-2020-28578 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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