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 — 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: 7.4%CVSS: 9.0Exploit: cisa kev · ssvc activeExposed services: Not assessed

A fix is available — apply it.

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
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA 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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact.
EPSS PROB
7.4%
EPSS %ILE
94th
KEV
⚠ Exploited

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

A fix is available. Apply it within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). 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

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

Vendor Advisories for CVE-2020-1040(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 98× in last 7d / 423× 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 1,744 total refreshes for this CVE.

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

Related CVEs(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 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 attention. A fix is available. Apply it.
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.
How do I remediate CVE-2020-1040?
A fix for CVE-2020-1040 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-1040 are linked in the Vendor Advisories panel on this page.

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