CVE-2020-1040

CRITICALNVD 9.09.0—
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 9.0 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 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: 7%CVSS: 9.0Exploit: cisa kev · ssvc activeExposed: 0

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

A remote code execution vulnerability exists when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user on a guest operating system, aka 'Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1032, CVE-2020-1036, CVE-2020-1041, CVE-2020-1042, CVE-2020-1043.

CVSS v3
9.0
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
7%
EPSS %ILE
94%
KEV
⚠ Exploited

Published

July 14, 2020

Last Modified

October 29, 2025

Advisory Details (2)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, 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-2020-1040
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1040

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 98× in last 7d / 373× 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 1,105 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2020-1040?
CVE-2020-1040 is a critical vulnerability published on July 14, 2020. A remote code execution vulnerability exists when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user on a guest operating system, aka 'Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1032, CVE-2020-1036,…
When was CVE-2020-1040 disclosed?
CVE-2020-1040 was first published in the National Vulnerability Database on July 14, 2020, with the most recent update on October 29, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-1040 actively exploited?
Yes. CISA added CVE-2020-1040 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Hyper-V RemoteFX. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-1040?
CVE-2020-1040 has a CVSS v3 base score of 9.0 (NVD).
Which products are affected by CVE-2020-1040?
CVE-2020-1040 affects Microsoft Hyper-V RemoteFX. 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-2020-1040?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-1040, 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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