What is the CVSS score of CVE-2023-21805?

CVE-2023-21805 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.7%.

Is there a patch available for CVE-2023-21805?

Yes, a patch is available for CVE-2023-21805. Update the affected software to the latest version immediately.

Windows 10 1607 CVE-2023-21805

HIGH

Command Injection (CWE-77)

2023-02-14 secure@microsoft.com

RCE Command Injection Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 22h2 Windows Server 2008 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows 11 21H2 Windows 10 Windows 10 20H2

7.8

CVSS 3.1 · Vendor: microsoft

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Vulnerability Assessment

Weakness	CWE CWE-77 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Command injection prevention MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.8 (HIGH). Attack characteristics: local attack vector, low complexity, no privileges required, user interaction required.
Exploit ScenarioDerived	A local attacker with access to the system could inject arbitrary commands into system command execution. No authentication is required to exploit this vulnerability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.7% exploitation probability (EPSS)

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AnalysisAI

Windows MSHTML Platform Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity. This Command Injection vulnerability could allow attackers to inject arbitrary commands into system command execution.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Use parameterized APIs, avoid shell execution, validate input with strict allowlists.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Command Injection (CWE-77), which allows attackers to inject arbitrary commands into system command execution. Affected products include: Microsoft Windows 10, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 20H2, Microsoft Windows 10 21H2.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (microsoft) PRIMARY 7.8 HIGH

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from Vendor (microsoft) · only source for this CVE.

CVSS VectorVendor: microsoft

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

Windows MSHTML Platform Remote Code Execution Vulnerability

Threat Intelligence Overview

EPSS Score

0.7%

Top 50% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.7%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Defer

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +39

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

OS Command Injection CRITICAL

OS command injection occurs when an application passes unsanitized user input directly into system shell commands.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)CVE.org

cpe:2.3:o:microsoft:windows_10:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21805 ADVISORY https://vuldb.com/vuln/221008

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