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Full vulnerability report · 2023
CVE-2023-29336High confidence

Microsoft Win32K Privilege Escalation Vulnerability

Microsoft · Win32k

7.8HighCVSS 3.1
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2023-05-30 as the remediation due date.

Patch available
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2023-32910

CISA KEV mirrored by ENISA

Win32k Elevation of Privilege Vulnerability

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 9 May 2023. Evidence sources: cisa_kev.
ENISA score
7.8 · CVSS 3.1
Advisory evidence
2 linked advisory records
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2023-05-30 as the remediation due date.

Patch available
01

What, why and how

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation up to SYSTEM privileges.

What

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation up to SYSTEM privileges.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

What

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation up to SYSTEM privileges.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2023-05-09.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
local access → Use After Free → gain additional privileges
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-416 ↗

CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
Privilege escalationCWE-416CISA KEVPublic exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2023-32910Known-exploited evidence recorded

Win32k Elevation of Privilege Vulnerability

Official EUVD record ↗
BSI · German · WID-SEC-2023-1178Microsoft Windows und Microsoft Windows Server: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Windows und Microsoft Windows Server ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand auszulösen und seine Privilegien zu erweitern

Official advisory ↗
Canadian Centre for Cyber Security · English · AV23-255Microsoft security advisory – May 2023 monthly rollup - Update 1 (AV23-255)

On May 9, 2023, Microsoft published Security Updates to address vulnerabilities in multiple products. Included were critical updates for the following: Microsoft has indicated that CVE-2023-24932 and CVE-2023-29336 have been exploited.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20230510Security Bulletin 10 May 2023

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 10 May 2023, published on 10 May 2023. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0373Multiples vulnérabilités dans Microsoft Windows

CVE-2023-24949 du 09 mai 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-24949 Bulletin de sécurité Microsoft CVE-2023-28251 du 09 mai 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28251 Bulletin de sécurité Microsoft CVE-2023-28283 du 09 mai 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28283 Bulletin de sécurité Microsoft CVE-2023-29324 du 09 mai 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29324 Bulletin de sécurité Microsoft CVE-2023-29325 du 09 mai 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29325 Bulletin de sécurité Microsoft CVE-2023-29336 du 09 mai 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29336 Bulletin de sécurité Microsoft CVE-2023-29343 du 09 mai 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29343 Référence CVE CVE-2023-24898 https://www.cve.org/CVERecord?id=CVE-2023-24898 Référence CVE CVE-2023-24899 https://www.cve.org/CVERecord?id=CVE-2023-24899 Référence CVE CVE-2023-24900 https://www.cve.org/CVERecord?id=CVE-2023-24900 Référence CVE CVE-2023-24901 https://www.cve.org/CVERecord?id=CVE-2023-24901 Référence CVE CVE-2023-24902 https://www.cve.org/CVERecord?id=CVE-2023-24902 Référence CVE CVE-2023-24903 https://www.cve.org/C

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2023-001848Microsoft Windows 10 および Windows Server における権限を昇格される脆弱性

Microsoft Windows 10 および Windows Server には、Win32k に不備があるため、権限を昇格される脆弱性が存在します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5936MS 6월 보안 위협에 따른 정기 보안 업데이트 권고

icrosoft Edge (Chromium-based) | CVE-2023-29345 | Microsoft Edge(Chromium 기반) 보안 기능 우회 취약성 | | Microsoft Office | CVE-2023-29344 | Microsoft Office 원격 코드 실행 취약성 | | SysInternals | CVE-2023-29343 | Windows용 SysInternals Sysmon 권한 상승 취약성 | | Microsoft Windows Codecs Library | CVE-2023-29341 | AV1 비디오 확장 원격 코드 실행 취약성 | | Microsoft Windows Codecs Library | CVE-2023-29340 | AV1 비디오 확장 원격 코드 실행 취약성 | | Microsoft Edge (Chromium-based) | CVE-2023-2934 | Chromium: CVE-2023-2934 Mojo에서 범위를 벗어난 메모리 액세스 | | Visual Studio Code | CVE-2023-29338 | Visual Studio Code 정보 유출 취약성 | | NuGet Client | CVE-2023-29337 | NuGet 클라이언트 원격 코드 실행 취약성 | | Windows Win32K | CVE-2023-29336 | Win32k 권한 상승 취약성 | | Microsoft Office Word | CVE-2023-29335 | Microsoft Word 보안 기능 우회 취약성 | | Microsoft Office Access | CVE-2023-29333 | Microsoft 서비스 액세스 거부 취약성 | | .NET Core | CVE-2023-29331 | .NET, .NET Framework, Visual Studio 서비스 거부 취약성 | | Microsoft Edge (Chromium-based) | CVE-2023-2933 | Chromium: CVE-2023-2933 PDF에서 UaF(Use after free) | | .NET Framework | CVE-2023-29326 | .NET Framework 원격 코드 실행 취약성 | | Windows OLE | CVE-2023-29325 | Windows OLE 원격 코드 실행 취약성 | | Windows MSHTML Platform | CVE-2023-29324 | Windows MSHTML Platform Security Feature Bypass Vulnerability | | Microsoft Edge (Chromium-based) | CVE-2023-2932 | Chromium: CV

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5917MS 5월 보안 위협에 따른 정기 보안 업데이트 권고

o 취약점 요약 정보 | 제품 카테고리 | CVE 번호 | CVE 제목 | | --- | --- | --- | | Microsoft Edge (Chromium-based) | CVE-2023-29354 | Microsoft Edge(Chromium 기반) 보안 기능 우회 취약성 | | Microsoft Edge (Chromium-based) | CVE-2023-29350 | Microsoft Edge(Chromium 기반) 권한 상승 취약성 | | Microsoft Office | CVE-2023-29344 | Microsoft Office 원격 코드 실행 취약성 | | SysInternals | CVE-2023-29343 | Windows용 SysInternals Sysmon 권한 상승 취약성 | | Microsoft Windows Codecs Library | CVE-2023-29341 | AV1 비디오 확장 원격 코드 실행 취약성 | | Microsoft Windows Codecs Library | CVE-2023-29340 | AV1 비디오 확장 원격 코드 실행 취약성 | | Visual Studio Code | CVE-2023-29338 | Visual Studio Code 정보 유출 취약성 | | Windows Win32K | CVE-2023-29336 | Win32k 권한 상승 취약성 | | Microsoft Office Word | CVE-2023-29335 | Microsoft Word 보안 기능 우회 취약성 | | Microsoft Edge (Chromium-based) | CVE-2023-29334 | Microsoft Edge(Chromium 기반) 스푸핑 취약성 | | Microsoft Office Access | CVE-2023-29333 | Microsoft 서비스 액세스 거부 취약성 | | Windows OLE | CVE-2023-29325 | Windows OLE 원격 코드 실행 취약성 | | Windows MSHTML Platform | CVE-2023-29324 | Windows MSHTML Platform Security Feature Bypass Vulnerability | | Microsoft Dynamics | CVE-2023-28314 | Microsoft Dynamics 365(온-프레미스) 교차-사이트 스크립팅 취약성 | | Dynamics 365 Customer Voice | CVE-2023-28313 | Microsoft Dynamics 365 Customer Voice 교차 사이트 스크립팅 취약성 | | Visual Studio | CVE-2023-28

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5916현재 악용되고 있는 Exploit(Update. 2023-05-09)

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation up to SYSTEM privileges.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 9 May 2023 · Last source change 21 Oct 2025, 23:05 UTC · CWE-416 · Use After Free

CVE recordCVE.org · 5.1
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2023-32910
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    10.0.10240.0 < 10.0.10240.19926; 10.0.14393.0 < 10.0.14393.5921; 6.0.6003.0 < 6.0.6003.22070; 6.1.7601.0 < 6.1.7601.26519 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    Windows 10 Version 1507: 10.0.10240.0 < 10.0.10240.19926; Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.5921; Windows Server 2016: 10.0.14393.0 < 10.0.14393.5921; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.5921; Windows Server 2008 Service Pack 2: 6.0.6003.0 < 6.0.6003.22070; Windows Server 2008 Service Pack 2 (Server Core installation): 6.0.6003.0 < 6.0.6003.22070; Windows Server 2008 Service Pack 2: 6.0.6003.0 < 6.0.6003.22070; Windows Server 2008 R2 Service Pack 1: 6.1.7601.0 < 6.1.7601.26519; Windows Server 2008 R2 Service Pack 1 (Server Core installation): 6.1.7601.0 < 6.1.7601.26519; Windows Server 2012: 6.2.9200.0 < 6.2.9200.24266; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.24266; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.20969; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.20969 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2023-32910↗CISA KEV record↗CVE authority or vendor reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2023-29336 · cve.blacktree.nl