What is the CVSS score of EUVD-2025-20579?

EUVD-2025-20579 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: 0.1%.

How to fix or mitigate EUVD-2025-20579?

Within 24 hours: Identify all systems running Workspace Broker and confirm current version inventory. Within 7 days: Apply vendor-released patch to all Workspace Broker instances; coordinate with relevant teams to schedule patching during maintenance windows. Within 30 days: Audit access logs for any suspicious privilege escalation attempts and validate that all systems have been patched and verified operational.

Windows 10 1507 EUVD-2025-20579

Q: Which versions of Windows 10 1507 are affected by EUVD-2025-20579?

CVE-2025-49665 is a privilege escalation vulnerability in Workspace Broker that allows authorized users to exploit a race condition and gain elevated system privileges on affected systems.. A patch is available.

| CVE-2025-49665 HIGH

Race Condition (CWE-362)

2025-07-08 secure@microsoft.com

Information Disclosure Race Condition Microsoft Windows 10 1507 Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 22h2 Windows 11 23h2 Windows 11 24h2 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2022 23h2 Windows Server 2025

7.8

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-362 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V15 - Secure Coding and Architecture Concurrency control, locking 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	Can lead to privilege escalation, data corruption, or bypassing of security checks depending on the context of the race. With a CVSS score of 7.8 (HIGH), this represents a significant risk.
Exploit ScenarioDerived	An attacker exploits a time-of-check-time-of-use (TOCTOU) window to modify a resource between when it's validated and when it's used.

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

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 16, 2026

Concurrent execution using shared resource with improper synchronization ('race condition') in Workspace Broker allows an authorized attacker to elevate privileges locally.

Earlier versions of this analysis (1)

v1 Mar 16, 2026 - 04:21 CVSS 7.8

RemediationAI

Use proper synchronization mechanisms (locks, mutexes, atomic operations). Implement file locking for filesystem operations. Avoid TOCTOU patterns.

Affected VersionsENISA

Windows Server 2025 (Server Core installation) 10.0.26100.0 <10.0.26100.4652

Windows Server 2016 10.0.14393.0 <10.0.14393.8246

Windows 11 version 22H2 10.0.22621.0 <10.0.22621.5624

Windows Server 2022 10.0.20348.0 <10.0.20348.3932

Windows 11 Version 23H2 10.0.22631.0 <10.0.22631.5624

Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 <10.0.25398.1732

Windows Server 2019 (Server Core installation) 10.0.17763.0 <10.0.17763.7558

Windows 10 Version 21H2 10.0.19044.0 <10.0.19044.6093

Windows 10 Version 1507 10.0.10240.0 <10.0.10240.21073

Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 <6.3.9600.22676

Windows Server 2012 (Server Core installation) 6.2.9200.0 <6.2.9200.25573

Windows Server 2025 10.0.26100.0 <10.0.26100.4652

Windows 11 Version 24H2 10.0.26100.0 <10.0.26100.4652

Windows 10 Version 1809 10.0.17763.0 <10.0.17763.7558

Windows Server 2012 R2 6.3.9600.0 <6.3.9600.22676

Windows 11 version 22H3 10.0.22631.0 <10.0.22631.5624

Windows Server 2019 10.0.17763.0 <10.0.17763.7558

Windows Server 2012 6.2.9200.0 <6.2.9200.25573

Windows Server 2016 (Server Core installation) 10.0.14393.0 <10.0.14393.8246

Windows 10 Version 1607 10.0.14393.0 <10.0.14393.8246

Windows 10 Version 22H2 10.0.19045.0 <10.0.19045.6093

Affected Packages

euvd windows_10_version_1507 fix: 10.0.10240.21073

euvd windows_10_version_1607 fix: 10.0.14393.8246

euvd windows_10_version_1809 fix: 10.0.17763.7558

euvd windows_10_version_21h2 fix: 10.0.19044.6093

euvd windows_10_version_22h2 fix: 10.0.19045.6093

euvd windows_11_version_22h2 fix: 10.0.22621.5624

euvd windows_11_version_22h3 fix: 10.0.22631.5624

euvd windows_11_version_23h2 fix: 10.0.22631.5624

euvd windows_11_version_24h2 fix: 10.0.26100.4652

euvd windows_server_2012 fix: 6.2.9200.25573

euvd windows_server_2012_r2 fix: 6.3.9600.22676

euvd windows_server_2012_r2_server_core_installation fix: 6.3.9600.22676

euvd windows_server_2012_server_core_installation fix: 6.2.9200.25573

euvd windows_server_2016 fix: 10.0.14393.8246

euvd windows_server_2016_server_core_installation fix: 10.0.14393.8246

euvd windows_server_2019 fix: 10.0.17763.7558

euvd windows_server_2019_server_core_installation fix: 10.0.17763.7558

euvd windows_server_2022 fix: 10.0.20348.3932

euvd windows_server_2022_23h2_edition_server_core_installation fix: 10.0.25398.1732

euvd windows_server_2025 fix: 10.0.26100.4652

euvd windows_server_2025_server_core_installation fix: 10.0.26100.4652

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 21 packages in euvd

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

Technical ContextAI · show details

A race condition occurs when the behavior of software depends on the timing of events, such as the order of execution of threads or processes.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 06:31 EUVD-patch-fix

executive summary

Patch available

Apr 16, 2026 - 05:29 EUVD

10.0.26100.4652,10.0.14393.8246,10.0.22621.5624

CVE Published

Jul 08, 2025 - 17:15 nvd

HIGH 7.8

Executive ViewAI

Why It Matters

CVE-2025-49665 is a privilege escalation vulnerability in Workspace Broker that allows authorized users to exploit a race condition and gain elevated system privileges on affected systems. This impacts any organization using Workspace Broker where user access controls depend on proper privilege isolation, potentially allowing insider threats or compromised user accounts to achieve administrative access.

Business Impact: High

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.1%

Top 82% exploitable

Data Quality

4 sources

Confidence: Medium

EUVD

NVD

CVE.org

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 No

Public POC No

EPSS 0.1%

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

Scheduled

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

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.

Race Condition MEDIUM

Race conditions occur when multiple concurrent requests exploit the brief time gap between checking a condition and acting upon it (TOCTOU - Time of Check, Time of Use).