What is the CVSS score of EUVD-2025-20603?

EUVD-2025-20603 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: 0.3%.

Is there a public PoC exploit available for EUVD-2025-20603?

Yes, a public proof-of-concept exploit is available for EUVD-2025-20603. Prioritise patching immediately. EPSS: 0.3%.

How to fix or mitigate EUVD-2025-20603?

Within 24 hours: Inventory all Windows systems running Windows Update Service and verify current patch status. Within 7 days: Apply vendor-released patches to all affected Windows systems; test patches in non-production environment first. Within 30 days: Audit local user access policies and implement principle of least privilege for standard user accounts to reduce the attack surface for privilege escalation vectors.

Windows EUVD-2025-20603

Q: Which versions of Windows are affected by EUVD-2025-20603?

CVE-2025-48799 is a privilege escalation vulnerability in Windows Update Service that allows authenticated local attackers to gain elevated system privileges through improper link resolution.. A patch is available.

| CVE-2025-48799 HIGH

Improper Link Resolution Before File Access (CWE-59)

2025-07-08 secure@microsoft.com

Windows Information Disclosure Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 22h2 Windows 11 23h2 Windows 11 24h2 Windows Server 2025

7.8

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-59 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V5 - File Handling Symlink resolution safety
Impact	CVSS score of 7.8 (HIGH).

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

Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 16, 2026

Improper link resolution before file access ('link following') in Windows Update Service allows an authorized attacker to elevate privileges locally.

Earlier versions of this analysis (1)

v1 Mar 16, 2026 - 04:21 CVSS 7.8

RemediationAI

Monitor vendor advisories for patches. Apply mitigations such as network segmentation, access restrictions, and monitoring.

Affected VersionsENISA

Windows 11 Version 24H2 10.0.26100.0 <10.0.26100.4652

Windows 11 version 22H3 10.0.22631.0 <10.0.22631.5624

Windows 10 Version 21H2 10.0.19044.0 <10.0.19044.6093

Windows 10 Version 1809 10.0.17763.0 <10.0.17763.7558

Windows 10 Version 1607 10.0.14393.0 <10.0.14393.8246

Windows 10 Version 22H2 10.0.19045.0 <10.0.19045.6093

Windows 11 version 22H2 10.0.22621.0 <10.0.22621.5624

Windows 11 Version 23H2 10.0.22631.0 <10.0.22631.5624

Windows Server 2025 10.0.26100.0 <10.0.26100.4652

Windows Server 2025 (Server Core installation) 10.0.26100.0 <10.0.26100.4652

Affected Packages

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_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 10 packages in euvd

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 Link Resolution Before File Access (CWE-59).

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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 - 06:32 EUVD-patch-fix

executive summary

Patch available

Apr 16, 2026 - 05:29 EUVD

10.0.26100.4652,10.0.22631.5624,10.0.19044.6093

PoC Detected

Sep 26, 2025 - 17:23 vuln.today

Public exploit code

CVE Published

Jul 08, 2025 - 17:15 nvd

HIGH 7.8

Executive ViewAI

Why It Matters

CVE-2025-48799 is a privilege escalation vulnerability in Windows Update Service that allows authenticated local attackers to gain elevated system privileges through improper link resolution. This impacts any organization running Windows systems where standard users have local access, potentially enabling attackers with valid credentials to obtain administrative control and compromise system integrity.

Business Impact: High

Compensating Controls

Apply vendor patch. If patching cannot be immediately completed: restrict local administrative capabilities and limit local login access for standard user accounts; monitor Windows Update Service activity logs for suspicious link resolution attempts; implement application whitelisting to prevent privilege escalation exploitation paths.

Threat Intelligence Overview

EPSS Score

0.3%

Top 49% exploitable

Exploit

POC

Public exploit code exists

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 Yes

EPSS 0.3%

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

Poc

System Exposure· derived

Small

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +39

PoC: +20

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.