CVE-2023-21817

CVEs › CVE-2023-21817

Description

Windows Kerberos Elevation of Privilege Vulnerability

Overview

State: PUBLISHED
Assigner (CNA): microsoft
CVSS severity: HIGH
CVSS score: 7.8 / 10
CVSS vector: 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
Effective score: 7.8 / 10 HIGH source: CNA overview
MSRC score: 7.8 / 10 HIGH MS rating: Important · Elevation of Privilege
CWE(s): CWE-287
Reserved: 2022-12-16
Published: 2023-02-14 08:00 UTC
Last updated: 2023-02-14 08:00 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2023/21xxx/CVE-2023-21817.json
Linked Threat: CVE-2023-21817 — Windows Kerberos Elevation of Privilege Vulnerability

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2023-25983
Assigner: microsoft
Published: Feb 14, 2023, 7:33:19 PM
Updated: Jan 1, 2025, 12:41:04 AM
EUVD base score (CVSS 3.1): 7.8 / 10
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
EUVD-reported EPSS: 1.0700
Vendors: Microsoft
Products: Windows Server 2008 Service Pack 2 (6.0.6003.0 <6.0.6003.21915)

Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.5717)

Windows Server 2022 (10.0.20348.0 <10.0.20348.1547)

Windows Server 2012 R2 (Server Core installation) (6.3.9600.0 <6.3.9600.20821)

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.5717)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.2604)

Windows Server 2008 R2 Service Pack 1 (Server Core installation) (6.1.7601.0 <6.1.7601.26366)

Windows 10 Version 20H2 (10.0.0 <10.0.19042.2604)

Windows Server 2008 Service Pack 2 (Server Core installation) (6.0.6003.0 <6.0.6003.21915)

Windows 11 version 22H2 (10.0.22621.0 <10.0.22621.1265)

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.4010)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.20821)

Windows Server 2019 (10.0.17763.0 <10.0.17763.4010)

Windows 10 Version 21H2 (10.0.19043.0 <10.0.19044.2604)

Windows Server 2012 (6.2.9200.0 <6.2.9200.24116)

Windows Server 2012 (Server Core installation) (6.2.9200.0 <6.2.9200.24116)

Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.4010)

Windows 10 Version 1809 (10.0.0 <10.0.17763.4010)

Windows Server 2016 (10.0.14393.0 <10.0.14393.5717)

Windows Server 2008 R2 Service Pack 1 (6.1.7601.0 <6.1.7601.26366)

Windows 11 version 21H2 (10.0.0 <10.0.22621.1574)

Windows Server 2008 Service Pack 2 (6.0.6003.0 <6.0.6003.21915)

Windows 10 Version 1507 (10.0.10240.0 <10.0.10240.19747)
Aliases: GHSA-4w7x-2jcw-qr33

ENISA description: Windows Kerberos Elevation of Privilege Vulnerability

EUVD references (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21817

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-08-11 01:49 UTC (source: CVRF).

MS severity: Important
Impact: Elevation of Privilege
MS CVSS base score: 7.8 / 10 (temporal 6.8)
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
Exploit assessment: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely;Older Software Release:Exploitation Less Likely;DOS:N/A
Release: 2023-Feb

Microsoft remediations / KB articles (28)

5022840 — Vendor Fix / Security Update (fixed build 10.0.17763.4010)
5022840 — Update
5022842 — Vendor Fix / Security Update (fixed build 10.0.20348.1547)
5022842 — Update
5022921 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.20348.1540)
5022834 — Vendor Fix / Security Update (fixed build 10.0.19042.2604)
5022834 — Update
5022836 — Vendor Fix / Security Update (fixed build 10.0.22621.1574)
5022845 — Vendor Fix / Security Update (fixed build 10.0.22621.1265)
5022845 — Update
5022858 — Vendor Fix / Security Update (fixed build 10.0.10240.19747)
5022838 — Vendor Fix / Security Update (fixed build 10.0.14393.5717)
5022890 — Vendor Fix / Monthly Rollup (fixed build 6.0.6003.21915)
5022890 — Update
5022893 — Vendor Fix / Security Only (fixed build 6.0.6003.21915)
5022893 — Update
5022872 — Vendor Fix / Monthly Rollup (fixed build 6.1.7601.26366)
5022872 — Update
5022874 — Vendor Fix / Security Only (fixed build 6.1.7601.26366)
5022874 — Update
5022903 — Vendor Fix / Monthly Rollup (fixed build 6.2.9200.24116)
5022903 — Update
5022895 — Vendor Fix / Security Only (fixed build 6.2.9200.24116)
5022895 — Update
5022899 — Vendor Fix / Monthly Rollup (fixed build 6.3.9600.20821)
5022899 — Update
5022894 — Vendor Fix / Security Only (fixed build 6.3.9600.20821)
5022894 — Update

Microsoft FAQ (1)

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Affected products (23)

Vendor	Product	Versions	Platforms
Microsoft	Windows 10 Version 1809	`10.0.17763.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 1809	`10.0.0` (affected)	ARM64-based Systems
Microsoft	Windows Server 2019	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2019 (Server Core installation)	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2022	`10.0.20348.0` (affected)	x64-based Systems
Microsoft	Windows 10 Version 20H2	`10.0.0` (affected)	32-bit Systems, ARM64-based Systems
Microsoft	Windows 11 version 21H2	`10.0.0` (affected)	x64-based Systems, ARM64-based Systems
Microsoft	Windows 10 Version 21H2	`10.0.19043.0` (affected)	32-bit Systems, ARM64-based Systems, x64-based Systems
Microsoft	Windows 11 version 22H2	`10.0.22621.0` (affected)	ARM64-based Systems, x64-based Systems
Microsoft	Windows 10 Version 22H2	`10.0.19045.0` (affected)	x64-based Systems, ARM64-based Systems, 32-bit Systems
Microsoft	Windows 10 Version 1507	`10.0.10240.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 1607	`10.0.14393.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows Server 2016	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2016 (Server Core installation)	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2008 Service Pack 2	`6.0.6003.0` (affected)	32-bit Systems
Microsoft	Windows Server 2008 Service Pack 2 (Server Core installation)	`6.0.6003.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows Server 2008 Service Pack 2	`6.0.6003.0` (affected)	x64-based Systems
Microsoft	Windows Server 2008 R2 Service Pack 1	`6.1.7601.0` (affected)	x64-based Systems
Microsoft	Windows Server 2008 R2 Service Pack 1 (Server Core installation)	`6.1.7601.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012	`6.2.9200.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 (Server Core installation)	`6.2.9200.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 R2	`6.3.9600.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 R2 (Server Core installation)	`6.3.9600.0` (affected)	x64-based Systems

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

Windows Kerberos Elevation of Privilege Vulnerability vendor-advisory

Web references (28)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

5022834 msrc
5022836 msrc
5022838 msrc
5022840 msrc
5022842 msrc
5022845 msrc
5022858 msrc
5022872 msrc
5022874 msrc
5022890 msrc
5022893 msrc
5022894 msrc
5022895 msrc
5022899 msrc
5022903 msrc
MSRC update guide: CVE-2023-21817 msrc
5022834 msrc
5022840 msrc
5022842 msrc
5022845 msrc
5022872 msrc
5022874 msrc
5022890 msrc
5022893 msrc
5022894 msrc
5022895 msrc
5022899 msrc
5022903 msrc

Remediations (18)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CISA flags two-year-old Oracle flaw as actively exploited in attacks

web:www.bleepingcomputer.com

CISA has ordered government agencies to secure their systems against a high-severity Oracle WebLogic Server vulnerability that was patched two years ago and is now actively exploited in attacks.

2026-06-04 14:45 UTC
ArcGIS Server Security 2025 Update 2 Patch - Esri

web:www.esri.com

Key highlights The ArcGIS Server Security 2025 update 2 is available This patch resolves 10 Medium severity vulnerabilities This security patch is cumulative, and includes fixes provided in the ArcGIS Server Security 2025 update 1.

2026-06-04 14:45 UTC
‎Google Gemini

web:gemini.google.com

Meet Gemini, Google's AI assistant. Get help with writing, planning, brainstorming, and more. Experience the power of generative AI.

2026-06-04 14:45 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-06-04 14:45 UTC
Critical Patch Updates, Critical Security Patch Updates ... - Oracle

web:www.oracle.com

Critical Security Patch Updates Critical Security Patch Updates provide security patches for supported Oracle on-premises products. A Critical Security Patch Update provides targeted, high-priority security fixes in a smaller, more focused format, making them easier to apply with minimal disruption.

2026-06-04 14:45 UTC
Patch Management - Tenable, Inc.

web:docs.tenable.com

Remediation and mitigation plans should be created based-off prioritization plans. Most legacy methods employ the CVSS to prioritize which vulnerabilities to remediate first. For example, a typical organizational policy is to remediate all vulnerabilities with a CVSS score of 7 and above.

2026-06-04 14:45 UTC
NVD - Home

web:nvd.nist.gov

The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, product names, and impact metrics. For ...

2026-06-04 14:45 UTC
Update Software, Mitigation M1051 - Enterprise | MITRE ATT&CK®

web:attack.mitre.org

This mitigation can be implemented through the following measures: Regular Operating System Updates Implementation: Apply the latest Windows security updates monthly using WSUS (Windows Server Update Services) or a similar patch management solution. Configure systems to check for updates automatically and schedule reboots during maintenance ...

2026-06-04 14:45 UTC
Vulnerability Remediation vs. Mitigation: What are the Differences ...

web:www.secure.com

Learn the difference between vulnerability remediation and mitigation , and how a risk-based strategy can strengthen your security posture.

2026-05-22 05:47 UTC
Microsoft Rolls Out Mitigations for 'YellowKey' BitLocker ...

web:www.securityweek.com

Microsoft has announced mitigations for CVE -2026-45585, a BitLocker bypass triggered via FsTx in Windows Recovery.

2026-05-22 05:47 UTC
Install Microsoft's emergency Windows patch now - ZDNET

web:www.zdnet.com

Install Microsoft's emergency Windows patch now - what it fixes and why it was rushed out Microsoft issued an out-of-band fix after its latest update introduced a nasty surprise.

2026-05-22 05:47 UTC
Microsoft Releases Mitigation for Windows BitLocker Security Bypass 0 ...

web:cybersecuritynews.com

No patch has been released yet; Microsoft has instead issued a multi-step manual mitigation guide while a formal security update is prepared. Windows BitLocker Security Bypass The vulnerability originates in WinRE's handling of the BootExecute registry value under HKLM\ControlSet001\Control\Session Manager.

2026-05-22 05:47 UTC
GitHub - Wemino/MadnessPatch: A patch that fixes various issues in the ...

web:github.com

A patch that fixes various issues in the PC port of Alice: Madness Returns.

2026-05-22 05:47 UTC
Microsoft Releases December 2025 Patch Tuesday Updates

web:petri.com

Microsoft's December 2025 Patch Tuesday delivers 56 security fixes and key improvements for Windows 11.

2026-05-22 05:47 UTC
The August Patch Tuesday updates for Windows 11 are here, and they fix ...

web:windowsreport.com

It's that time of the month again: Microsoft has rolled out its Patch Tuesday updates for Windows 11 versions 23H2, 22H2, and 21H2. Windows 11 23H2 and 22H2 users will see their systems updated through KB5041585, while those on 21H2 will receive KB5041592.

2026-05-22 05:47 UTC
Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws

web:www.bleepingcomputer.com

Today is Microsoft's March 2026 Patch Tuesday with security updates for 79 flaws, including 2 publicly disclosed zero-day vulnerabilities.

2026-05-22 05:47 UTC
Resolving Sweet32, Birthday Attacks on Windows Servers Via GPO

web:www.experts-exchange.com

Learn more about Resolving Sweet32, Birthday Attacks on Windows Servers Via GPO from the expert community at Experts Exchange

2026-05-22 05:47 UTC
Microsoft Technical Security Notifications

web:www.microsoft.com

Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.

2026-05-22 05:47 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2023-21817.json.

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