CVE-2023-29356

Code execution via freed-memory reuse

Published Jun 16, 2023 · Updated Feb 28, 2025

Use-after-free in Microsoft ODBC Driver for SQL Server allows attackers to execute code when a client connects to a malicious server. The driver accesses an object after releasing its memory while processing server-supplied data; Microsoft has not disclosed the affected function or object. Exploitation requires a user or application to initiate the connection, after which code can run in the client process.

CVSS severity7.8
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Microsoft ODBC Driver for SQL Server allows attackers to execute code when a client connects to a malicious server. The driver accesses an object after releasing its memory while processing server-supplied data; Microsoft has not disclosed the affected function or object. Exploitation requires a user or application to initiate the connection, after which code can run in the client process.

The record

CVE
CVE-2023-29356
Published
Jun 16, 2023
Updated
Feb 28, 2025
Vendor
Microsoft
Product
Microsoft Visual Studio 2019
Classifications
CWE-416
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 28, 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=16.11.0 <16.11.33

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Visual Studio 2019version=16.11.0 <16.11.33
Microsoft · Microsoft Visual Studio 2022 version 17.8version=17.8.0 <17.8.4
Microsoft · Microsoft Visual Studio 2022 version 17.6version=17.6.0 <17.6.11
Microsoft · Microsoft Visual Studio 2022 version 17.4version=17.4.0 <17.4.15
Microsoft · Microsoft ODBC Driver 18 for SQL Serverversion=18.0.0.0 <18.2.1.1; version=18.0.0.0 <18.2.2.1
Microsoft · Microsoft Visual Studio 2022 version 17.2version=17.2.0 <17.2.23
Microsoft · Microsoft ODBC Driver 17 for SQL Serverversion=17.0.0.0 <17.10.4.1

Published CVSS scores

7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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