CVE-2017-0021

CRITICALNVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

Score 9.0 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.7%CVSS: 9.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Hyper-V in Microsoft Windows 10 1607 and Windows Server 2016 does not properly validate vSMB packet data, which allows attackers to execute arbitrary code on a target OS, aka "Hyper-V System Data Structure Vulnerability." This vulnerability is different from that described in CVE-2017-0095.

CVSS v3
9.0
EG Score
9.0CRITICALmedium confidence
EG Risk
46
EG Risk 46/100CISA 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%
Exploitation2% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.7%
EPSS %ILE
76th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

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

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · 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

March 17, 2017

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated May 22, 2026
Patch available. Sources: microsoft.
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-2017-0021
generic
http://www.securitytracker.com/id/1037999
generic
http://www.securityfocus.com/bid/96020

Vendor Advisories for CVE-2017-0021(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 21× 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 149 total refreshes for this CVE.

  1. 2026-10-03 14:21 UTCEPSS rescore
  2. 2026-10-03 14:21 UTCEPSS rescore
  3. 2026-09-30 14:58 UTCEPSS rescore
  4. 2026-09-30 09:18 UTCEG score recompute
  5. 2026-09-28 13:45 UTCEPSS rescore
  6. 2026-09-27 13:40 UTCEPSS rescore
  7. 2026-09-26 15:53 UTCEPSS rescore
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  20. 2026-09-07 15:56 UTCEPSS rescore
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  25. 2026-08-28 21:35 UTCEPSS rescore
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  1. 2026-08-27 14:20 UTCEPSS rescore
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  4. 2026-08-21 23:44 UTCEPSS rescore
  5. 2026-08-19 16:59 UTCEPSS rescore
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  11. 2026-08-12 13:46 UTCEPSS rescore
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  21. 2026-07-30 16:24 UTCEPSS rescore
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  24. 2026-07-28 15:31 UTCEPSS rescore
  25. 2026-07-26 14:50 UTCEPSS rescore
  26. 2026-07-25 14:13 UTCEPSS rescore
  27. 2026-07-24 14:13 UTCEPSS rescore
  28. 2026-07-23 14:15 UTCEPSS rescore
  29. 2026-07-23 01:25 UTCEG score recompute
  30. 2026-07-22 22:04 UTCEG score recompute
  31. 2026-07-22 14:04 UTCEPSS rescore
  32. 2026-07-21 15:21 UTCEPSS rescore
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  45. 2026-07-15 01:56 UTCEPSS rescore
  46. 2026-07-13 22:26 UTCEPSS rescore
  47. 2026-07-13 06:09 UTCEPSS rescore
  48. 2026-07-12 05:43 UTCEPSS rescore
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  50. 2026-07-11 08:24 UTCEPSS rescore
  51. 2026-07-09 19:06 UTCEPSS rescore
  52. 2026-07-08 15:10 UTCEPSS rescore
  53. 2026-07-07 13:42 UTCEPSS rescore
  54. 2026-07-06 16:24 UTCEPSS rescore
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  61. 2026-06-30 23:19 UTCEPSS rescore
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  63. 2026-06-29 14:03 UTCEPSS rescore
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  65. 2026-06-28 04:53 UTCEPSS rescore
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  67. 2026-06-25 13:47 UTCEPSS rescore
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  69. 2026-06-23 21:30 UTCEPSS rescore
  70. 2026-06-22 14:23 UTCEPSS rescore
  71. 2026-06-21 14:54 UTCEPSS rescore
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  73. 2026-06-21 01:57 UTCEPSS rescore
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  75. 2026-06-19 19:23 UTCEPSS rescore

Frequently asked(5)

What is CVE-2017-0021?
CVE-2017-0021 is a critical vulnerability published on March 17, 2017. Hyper-V in Microsoft Windows 10 1607 and Windows Server 2016 does not properly validate vSMB packet data, which allows attackers to execute arbitrary code on a target OS, aka "Hyper-V System Data Structure Vulnerability." This vulnerability is different from that described in CVE-2017-0095.
When was CVE-2017-0021 disclosed?
CVE-2017-0021 was first published on March 17, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-0021 actively exploited?
CVE-2017-0021 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.7% probability of exploitation in the next 30 days (76th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-0021?
CVE-2017-0021 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2017-0021?
A fix for CVE-2017-0021 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2017-0021 are linked in the Vendor Advisories panel on this page.

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