What is the CVSS score of CVE-2021-42277?

CVE-2021-42277 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.8%.

Is there a patch available for CVE-2021-42277?

Yes, a patch is available for CVE-2021-42277. Update the affected software to the latest version immediately.

Visual Studio CVE-2021-42277

MEDIUM

Improper Privilege Management (CWE-269)

2021-11-10 secure@microsoft.com

Privilege Escalation Microsoft Visual Studio Visual Studio 2017 Visual Studio 2019 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows 10 Windows 11

5.5

CVSS 3.1 · Vendor: microsoft

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Vulnerability Assessment

Weakness	CWE CWE-269 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V8 - Authorization Least privilege enforcement MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation 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 5.5 (MEDIUM). Attack characteristics: local attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived	A local attacker with access to the system could escalate privileges to gain unauthorized elevated access.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.8% exploitation probability (EPSS)

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AnalysisAI

Diagnostics Hub Standard Collector Elevation of Privilege Vulnerability. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. This Improper Privilege Management vulnerability could allow attackers to escalate privileges to gain unauthorized elevated access.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply principle of least privilege, validate privilege transitions, implement proper role separation.

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 Improper Privilege Management (CWE-269), which allows attackers to escalate privileges to gain unauthorized elevated access. Diagnostics Hub Standard Collector Elevation of Privilege Vulnerability Affected products include: Microsoft Visual Studio, Microsoft Visual Studio 2017, Microsoft Visual Studio 2019, Microsoft Windows 10, Microsoft Windows 11.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (microsoft) PRIMARY 5.5 MEDIUM

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

None

Integrity

None

Availability

High

DescriptionCVE.org

Diagnostics Hub Standard Collector Elevation of Privilege Vulnerability

Threat Intelligence Overview

EPSS Score

0.8%

Top 48% 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 MEDIUM

CISA KEV No

Public POC No

EPSS 0.8%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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: +28

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

Affected Products (CPE)CVE.org

cpe:2.3:a:microsoft:visual_studio:2015:update3:*:*:*:*:*:*

cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*

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

cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:21h1:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:x64:*

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

cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*

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://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42277 ADVISORY https://vuldb.com/vuln/186398 REF https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42277 REF https://www.zerodayinitiative.com/advisories/ZDI-21-1306/

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