What is the CVSS score of CVE-2025-48821?

CVE-2025-48821 has a CVSS 3.1 base score of 7.1 (High). CVSS vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Windows are affected by CVE-2025-48821?

CVE-2025-48821 is a privilege escalation vulnerability in Windows UPnP Device Host that allows authorized network attackers to gain elevated privileges on affected systems.. A patch is available.

How to fix or mitigate CVE-2025-48821?

Within 24 hours: Inventory systems with UPnP Device Host enabled and identify network exposure. Within 7 days: Apply vendor-released patch to all affected Windows systems; disable UPnP on non-essential devices. Within 30 days: Conduct network segmentation review to restrict UPnP traffic between trust boundaries and verify patch deployment across the organization.

Windows CVE-2025-48821

EUVD-2025-20586 HIGH

Use After Free (CWE-416)

2025-07-08 secure@microsoft.com

Windows Denial Of Service Use After Free Memory Corruption 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 2008 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2022 23h2 Windows Server 2025

7.1

CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Adjacent

Attack Complexity

High

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

Re-analysis Queued

Apr 16, 2026 - 05:29 backfill_euvd_patch

patch_released

Patch available

Apr 16, 2026 - 05:29 EUVD

10.0.17763.7558,6.1.7601.27820,6.0.6003.23418

EUVD ID Assigned

Mar 16, 2026 - 04:21 euvd

EUVD-2025-20586

Analysis Generated

Mar 16, 2026 - 04:21 vuln.today

CVE Published

Jul 08, 2025 - 17:15 nvd

HIGH 7.1

DescriptionNVD

Use after free in Windows Universal Plug and Play (UPnP) Device Host allows an authorized attacker to elevate privileges over an adjacent network.

Analysis

Use after free in Windows Universal Plug and Play (UPnP) Device Host allows an authorized attacker to elevate privileges over an adjacent network.

Technical ContextAI

A use-after-free vulnerability occurs when a program continues to use a pointer after the referenced memory has been freed, leading to undefined behavior. This vulnerability is classified as Use After Free (CWE-416).

RemediationAI

Use memory-safe languages. Implement proper object lifecycle management. Use static and dynamic analysis tools to detect UAF patterns.

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CVE-2025-48821 vulnerability details – vuln.today

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Windows CVE-2025-48821

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

Analysis

Technical ContextAI

RemediationAI

More from same product – last 7 days

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External POC / Exploit Code