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CVE-2020-0890· NVD / CVE Program· CNA microsoft

Windows Hyper-V Denial of Service Vulnerability

Noroxi assessment

Priority: Monitor (action score 27/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.8% (FIRST EPSS); higher than 86.5% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

<p>A denial of service vulnerability exists when Microsoft Hyper-V on a host server fails to properly validate specific malicious data from a user on a guest operating system.</p> <p>To exploit the vulnerability, an attacker who already has a privileged account on a guest operating system, running as a virtual machine, could run a specially crafted application.</p> <p>The security update addresses the vulnerability by resolving the conditions where Hyper-V would fail to handle these requests.</p>

MediumCVSS 6.5 · v3.1—Proof of concept No fix recorded
Published
Sep 11, 2020
Updated
Jun 16, 2026
EPSS
2.8% · 86th percentile
CWE
—

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.8%

CNA vs NVD score

NVD
—
CNA · microsoft
6.5
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2020-0890

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
microsoftwindows 10
microsoftwindows server 2016
microsoftwindows server 2019

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft windows server 20161903
  • microsoft windows server 20161909
  • microsoft windows server 20162004
  • microsoft windows server 2019all versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Windows 10 Version 1803

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows 10 Version 1809

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows 10 Version 1903 for 32-bit Systems

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows 10 Version 1903 for ARM64-based Systems

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows 10 Version 1903 for x64-based Systems

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows 10 Version 1909

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows 10 Version 2004

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows Server 2019

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows Server 2019 (Server Core installation)

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows Server version 2004

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows Server, version 1903 (Server Core installation)

    • 10.0.0 and later · before publicationaffected

  • Microsoft Windows Server, version 1909 (Server Core installation)

    • 10.0.0 and later · before publicationaffected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2015-2426Buffer underflow in atmfd.dll in the Windows Adobe Type Manager Library in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, KEV
    91Now
  • CVE-2022-21907HTTP Protocol Stack Remote Code Execution Vulnerability
    67This week
  • CVE-2022-26809Remote Procedure Call Runtime Remote Code Execution Vulnerability
    66This week

Published before and after this one in the same product

  • ← EarlierCVE-2020-0875Sep 11, 2020 · Microsoft splwow64 Information Disclosure Vulnerability
    23Monitor
  • ← EarlierCVE-2020-0886Sep 11, 2020 · Windows Storage Services Elevation of Privilege Vulnerability
    31Monitor
  • Later →CVE-2020-0904Sep 11, 2020 · Windows Hyper-V Denial of Service Vulnerability
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:382020-09-03
Proof-of-concept repository on GitHubstars:02022-03-19

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-9 d
  2. Published
  3. TodayOct 23, 2026+2233 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records