What is the CVSS score of CVE-2021-41357?

CVE-2021-41357 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 2.0%.

Is CVE-2021-41357 being actively exploited?

Yes, CVE-2021-41357 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

Is there a patch available for CVE-2021-41357?

Yes, a patch is available for CVE-2021-41357. Update the affected software to the latest version immediately.

Windows Server 2022 CVE-2021-41357

HIGH

2021-10-13 secure@microsoft.com

Information Disclosure Microsoft Windows Server 2022 Windows 11 21H2 Windows 10 20H2 Windows 10 21H1 Windows Server 2004 Windows 10 2004 Windows Server 20H2

7.8

CVSS 3.1 · Vendor: microsoft

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Vulnerability Assessment

Impact	CVSS score of 7.8 (HIGH). Attack characteristics: local attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived	Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: In CISA KEV with patch available.

Exploited in the wild (CISA KEV) Patch available 2.0% exploitation probability (EPSS)

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AnalysisAI

Win32k Elevation of Privilege Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

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

Technical ContextAI · show details

Affected products include: Microsoft Windows 10 2004, Microsoft Windows 10 20H2, Microsoft Windows 10 21H1, Microsoft Windows 11 21H2, Microsoft Windows Server 2004.

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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:L/UI:N/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

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Oct 13, 2021 - 01:15 cve.org

HIGH 7.8

DescriptionCVE.org

Win32k Elevation of Privilege Vulnerability

Threat Intelligence Overview

EPSS Score

2.0%

Top 22% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

CISA KEV

EPSS

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 Yes

Public POC No

EPSS 2.0%

Patch available Yes

Active threat Yes

Deciding rule

In CISA KEV with patch available

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

Out-of-Cycle

Exploitation· derived

Active

System Exposure· derived

Small

Automatable· derived

Human Impact· derived

High

Priority Score

Low Medium High Critical

KEV: +50

EPSS: +2

CVSS: +39

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*

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

cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*

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

cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*

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

cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41357 REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41357

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