CVE-2023-21805

CVEs › CVE-2023-21805

Description

Windows MSHTML Platform Remote Code Execution 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:N/UI:R/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 · Remote Code Execution
CWE(s): CWE-77
Reserved: 2022-12-16
Published: 2023-02-14 08:00 UTC
Last updated: 2023-03-02 08:00 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2023/21xxx/CVE-2023-21805.json
Linked Threat: CVE-2023-21805 — Windows MSHTML Platform Remote Code Execution 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-2023-25972
Assigner: microsoft
Published: Feb 14, 2023, 7:33:10 PM
Updated: Jan 1, 2025, 12:41:00 AM
EUVD base score (CVSS 3.1): 7.8 / 10
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EUVD-reported EPSS: 1.0800
Vendors: Microsoft
Products: Windows Server 2019 (10.0.17763.0 <10.0.17763.4010)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.20821)

Windows Server 2022 (10.0.20348.0 <10.0.20348.1547)

Windows 10 Version 20H2 (10.0.0 <10.0.19042.2604)

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

Windows Server 2012 (6.2.9200.0 <6.2.9200.24116)

Windows 11 version 21H2 (10.0.0 <10.0.22621.1574)

Windows 10 Version 21H2 (10.0.19043.0 <10.0.19044.2604)

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

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

Windows Server 2008 Service Pack 2 (6.0.6003.0 <6.0.6003.21915)

Windows Server 2016 (10.0.14393.0 <10.0.14393.5717)

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

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.4010)

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

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.5717)

Windows 10 Version 1809 (10.0.0 <10.0.17763.4010)

Windows 10 Version 1507 (10.0.10240.0 <10.0.10240.19747)

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

Windows Server 2008 Service Pack 2 (6.0.6003.0 <6.0.6003.21915)

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

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.2604)

Windows 11 version 22H2 (10.0.22621.0 <10.0.22621.1265)
Aliases: GHSA-grqq-prph-hfgm

ENISA description: Windows MSHTML Platform Remote Code Execution Vulnerability

EUVD references (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21805

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: Remote Code Execution
MS CVSS base score: 7.8 / 10 (temporal 6.8)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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;DOS:N/A
Release: 2023-Feb

Microsoft remediations / KB articles (29)

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
5022835 — Vendor Fix / IE Cumulative (fixed build 1.1.0.0)
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)

According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution?

The word Remote in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally.

For example, when the score indicates that the Attack Vector is Local and User Interaction is Required, this could describe an exploit in which an attacker, through social engineering, convinces a victim to download and open a specially crafted file from a website which leads to a local attack on their computer.

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 MSHTML Platform Remote Code Execution Vulnerability vendor-advisory

Web references (29)

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
5022835 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-2023-21805 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 (17)

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

May 2025 - Patch Tuesday Release Notes

web:patchtuesday.com

Patch Tuesday Release Notes from Microsoft for March 2025 on the Patch Tuesday Blog.

2026-06-04 13:45 UTC
Patch Tuesday, January 2026 Edition - Krebs on Security

web:krebsonsecurity.com

This entry was posted on Tuesday 13th of January 2026 07:47 PM Latest Warnings The Coming Storm Time to Patch

2026-06-04 13:45 UTC
Cisco warns of critical Unified CM flaw with PoC exploit code

web:www.bleepingcomputer.com

Cisco has released security updates to patch a critical-severity Unified Communications Manager (Unified CM) flaw that allows attackers to gain root privileges.

2026-06-04 13:45 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-06-04 13:45 UTC
For January, Patch Tuesday starts off with a bang - Computerworld

web:www.computerworld.com

The latest update from Microsoft deals with 112 flaws, including eight the company rated critical — and three zero-day exploits. Ninety-five of the vulnerabilities affect Windows.

2026-06-04 13:45 UTC
Patch Tuesday - November 2025 - Rapid7

web:www.rapid7.com

Microsoft is publishing 66 new vulnerabilities today, which is far fewer than we've come to expect in recent months. However, the lone zero-day vulnerability this month demands attention.

2026-06-04 13:45 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 13:45 UTC
Microsoft mitigates YellowKey BitLocker bypass, no patch yet

web:www.notebookcheck.net

Microsoft released mitigation steps for YellowKey ( CVE -2026-45585), a BitLocker bypass that grants physical attackers access to encrypted Windows drives.

2026-05-22 05:47 UTC
PATCH Career Institute

web:www.patchcareerinstitute.com

P.A.T.C.H . Career Institute's mission is to provide quality training to students in the medical and vocational field. Our primary focus is to provide affordable, and competitive educational training for low to moderate income students.

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

web:cybersecuritynews.com

Microsoft has disclosed a critical zero-day vulnerability in Windows BitLocker, tracked as CVE -2026-45585, that allows threat actors with physical access to bypass full-disk encryption entirely, potentially exposing sensitive data within minutes.

2026-05-22 05:47 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-22 05:47 UTC
Pennsylvania Access To Criminal History - Home - pa

web:epatch.pa.gov

Why does PATCH exist? Its purpose is to better enable the public to obtain criminal history record checks. The repository was created and is maintained in accordance with Pennsylvania's Criminal History Information Act contained in Chapter 91 of Title 18, Crimes Code. This Act also directs the Pennsylvania State Police (PSP) to disseminate criminal history data to criminal justice agencies ...

2026-05-22 05:47 UTC
Nvd - Cve-2023-21805

web:nvd.nist.gov

Information Technology Laboratory National Vulnerability Database Vulnerabilities

2026-05-22 05:47 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.

2026-05-22 05:47 UTC
April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

2026-05-22 05:47 UTC
Microsoft provides mitigation for "YellowKey" BitLocker bypass flaw ...

web:www.helpnetsecurity.com

Microsoft is working on a fix for CVE -2026-45585 (aka "Yellowkey"), a vulnerability that can be used to bypass Windows' BitLocker protection.

2026-05-22 05:47 UTC
Microsoft Rushes Out Emergency Mitigation For 'YellowKey ... - LinkedIn

web:www.linkedin.com

Microsoft Security Response Center has issued an emergency mitigation for a newly disclosed BitLocker bypass vulnerability known as "YellowKey," after security researchers publicly released ...

2026-05-22 05:47 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2023-21805.json.

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