CVE-2023-36407

Local privilege escalation via improper input validation

Published Nov 14, 2023 · Updated Oct 8, 2025

Improper input validation in Microsoft Windows Hyper-V allows local users with low privileges to elevate privileges on affected systems. Microsoft identifies CWE-20 but has not published the affected function, input, or validation failure in the Hyper-V code path. Exploitation requires local access and existing low privileges; the resulting privilege level is not publicly specified.

CVSS severity7.8
High
EPSS probability1.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Microsoft Windows Hyper-V allows local users with low privileges to elevate privileges on affected systems. Microsoft identifies CWE-20 but has not published the affected function, input, or validation failure in the Hyper-V code path. Exploitation requires local access and existing low privileges; the resulting privilege level is not publicly specified.

The record

CVE
CVE-2023-36407
Published
Nov 14, 2023
Updated
Oct 8, 2025
Vendor
Microsoft
Product
Windows 11 version 21H2
Classifications
CWE-20, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.0 <10.0.22000.2600

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.2600
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.531
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.2715
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.2715
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.2715
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.2113

Published CVSS scores

7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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