CVE-2023-23388Public exploit

Local privilege escalation via negative Bluetooth event index

Published Mar 14, 2023 · Updated Jan 1, 2025

Incorrect numeric conversion in the Windows Bluetooth Service in affected Windows 10, 11, and Server builds allows local users to elevate privileges. BrokerLib.dll checks signed EventType values only against the dispatch table's upper bound, so a negative RPC value indexes before the handler array and invokes an unintended pointer. Bluetooth must be enabled, and the caller must run in an AppContainer with Bluetooth capability; the published proof of concept crashes bthserv and demonstrates LOCAL SERVICE access.

CVSS severity8.8
High
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect numeric conversion in the Windows Bluetooth Service in affected Windows 10, 11, and Server builds allows local users to elevate privileges. BrokerLib.dll checks signed EventType values only against the dispatch table's upper bound, so a negative RPC value indexes before the handler array and invokes an unintended pointer. Bluetooth must be enabled, and the caller must run in an AppContainer with Bluetooth capability; the published proof of concept crashes bthserv and demonstrates LOCAL SERVICE access.

The record

CVE
CVE-2023-23388
Published
Mar 14, 2023
Updated
Jan 1, 2025
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-681, 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 Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.5786
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 Server 2016version=10.0.14393.0 <10.0.14393.5786
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 10 Version 1607version=10.0.14393.0 <10.0.14393.5786
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

8.8MicrosoftCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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 exploitPublished

Weakness, pattern, technique

CWE-681Incorrect Conversion between Numeric Types
T1068Exploitation for Privilege Escalation

Public exploit references

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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