CVE-2023-23393

SYSTEM elevation via BrokerInfrastructure race condition

Published Mar 14, 2023 · Updated Jan 1, 2025

A race condition in Microsoft Windows BrokerInfrastructure Service allows local users on affected builds to elevate privileges to SYSTEM. Microsoft identifies improper locking and concurrent access but has not disclosed the specific code locus or competing operations. Exploitation requires existing low-privilege local access and winning a high-complexity race; success grants complete control of the affected host.

CVSS severity7.0
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Microsoft Windows BrokerInfrastructure Service allows local users on affected builds to elevate privileges to SYSTEM. Microsoft identifies improper locking and concurrent access but has not disclosed the specific code locus or competing operations. Exploitation requires existing low-privilege local access and winning a high-complexity race; success grants complete control of the affected host.

The record

CVE
CVE-2023-23393
Published
Mar 14, 2023
Updated
Jan 1, 2025
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-362, CWE-591, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=10.0.17763.0 <10.0.17763.4131

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.4131
Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.1696
Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19044.2728
Microsoft · Windows 10 Version 20H2version=10.0.0 <10.0.19042.2728
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.2728
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.4131
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.1413
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.1607
Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.4131; version=10.0.17763.0 <10.0.17763.4131

Published CVSS scores

7.0Microsoft CorporationCVSS:3.1/AV:L/AC:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-591Sensitive Data Storage in Improperly Locked Memory
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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