What is the CVSS score of EUVD-2026-44115?

EUVD-2026-44115 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: 2.3%.

Which versions of Windows WWAN Service are affected by EUVD-2026-44115?

The Windows Wireless Wide Area Network Service (WwanSvc) contains a local privilege escalation vulnerability (CVSS 7.8) affecting Windows 10, Windows 11, and Windows Server systems, allowing any…. A patch is available.

How to fix or mitigate EUVD-2026-44115?

Within 24 hours, identify and inventory all Windows 10, Windows 11, and Windows Server systems across your environment and assess patch applicability. Within 7 days, deploy the vendor patch through your change management and patch deployment processes, prioritizing production systems and critical infrastructure. Within 30 days, verify patch deployment across 100% of affected systems through your endpoint management tools, establish monitoring for WwanSvc anomalies, and document remediation completion for audit records.

Windows WWAN Service EUVD-2026-44115

| CVE-2026-50509 HIGH

Deserialization of Untrusted Data (CWE-502)

2026-07-14 microsoft

GHSA-4jqm-4jm7-mqg5

Deserialization Microsoft Windows Server 2016 Windows Server 2019 Windows Server 2025 Windows 10 Version 1607 Windows 10 Version 1809 Windows 10 Version 21H2 Windows 10 Version 22H2 Windows Server 2016 Server Core Installation Windows Server 2019 Server Core Installation Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 Version 26H1 Windows Server 2025 Server Core Installation

7.8

CVSS 3.1 · Vendor: microsoft

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

vuln.today AI

7.8 HIGH

Local vector and low complexity with an existing low-privileged account (AV:L/AC:L/PR:L), no interaction, yielding SYSTEM-level full C/I/A impact in an unchanged scope.

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

4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

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

Analysis Generated

Jul 14, 2026 - 19:52 vuln.today

CVE Published

Jul 14, 2026 - 17:08 nvd

HIGH 7.8

DescriptionCVE.org

Deserialization of untrusted data in Windows Wireless Wide Area Network Service allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in the Windows Wireless Wide Area Network Service (WwanSvc) lets an authenticated low-privileged user elevate to SYSTEM by delivering crafted serialized data that the service deserializes unsafely (CWE-502). Reported by Microsoft, it affects a broad range of Windows 10, Windows 11, and Windows Server builds and carries CVSS 7.8 with high confidentiality, integrity, and availability impact. No public exploit is identified at time of analysis and it is not in CISA KEV, but a vendor patch is available.

Technical ContextAI

The affected component is the Windows Wireless Wide Area Network Service (WwanSvc), the OS service that manages cellular/mobile broadband (WWAN) connectivity on Windows. The root cause is CWE-502, deserialization of untrusted data: the service reconstructs objects from attacker-influenced serialized input without adequately validating type or content, allowing manipulation of the object graph to reach dangerous code paths or corrupt state within the privileged service context. Per the CPE data, the vulnerable code ships across microsoft:windows_10 (1607, 1809, 21H2, 22H2), microsoft:windows_11 (24H2, 25H2, 26H1), and Windows Server 2016, 2019, and 2025 including Server Core installations, indicating shared library code common to modern Windows servicing branches.

RemediationAI

Apply the Microsoft security update for CVE-2026-50509 for your specific Windows build; a vendor patch is available and the authoritative per-product fixed versions are listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50509 (Patch available per vendor advisory). Because the flaw is a local elevation-of-privilege in the WWAN service, prioritize patching multi-user systems, terminal/RDP hosts, and any machine where untrusted users hold interactive or low-privilege access. Where immediate patching is not possible, a specific compensating control is to stop and disable the Wireless WAN Service (WwanSvc) on systems that do not use cellular/mobile broadband hardware, which removes the reachable attack surface at the cost of losing WWAN/cellular connectivity; additionally, tighten local account controls to limit which users can run code on affected hosts. Verify patch deployment through update-management reporting rather than assuming coverage.