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Severity by source

Vendor (microsoft) PRIMARY
HIGH
qualitative
NVD
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
6.1 MEDIUM
cvss
vuln.today AI
7.8 HIGH

Requires a local low-privileged session (AV:L/PR:L) with no user interaction and low complexity; a kernel UAF yielding SYSTEM gives total C/I/A impact.

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 VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Updated
Jul 16, 2026 - 20:00 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 16, 2026 - 19:52 vuln.today
cvss_changed
CVSS changed
Jul 16, 2026 - 19:52 NVD
7.0 (HIGH) 7.8 (HIGH)
Analysis Generated
Jul 14, 2026 - 21:51 vuln.today
CVE Published
Jul 14, 2026 - 17:06 nvd
HIGH 7.0

DescriptionNVD

Use after free in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in the Windows TCP/IP stack lets a low-privileged authenticated user corrupt kernel memory via a use-after-free (CWE-416) and elevate to SYSTEM. It affects a broad range of Windows 10, Windows 11, and Windows Server builds through 2025, was reported by Microsoft, and carries CVSS 7.8; there is no public exploit identified at time of analysis and EPSS is low (0.20%, 10th percentile).

Technical ContextAI

The flaw resides in the Windows TCP/IP kernel component (tcpip.sys), the core network protocol driver that processes IP/TCP/UDP traffic and socket operations in ring 0. The root cause is a use-after-free (CWE-416): a kernel object is freed while a dangling reference remains, and subsequent access to that stale pointer allows an attacker to manipulate freed-and-reallocated memory. Because the vulnerable code executes with kernel privileges, controlled reuse of the freed allocation can be leveraged to overwrite kernel structures or hijack execution flow, yielding SYSTEM-level control. The CPE set confirms the affected surface is the OS itself across client and server SKUs rather than an add-on application.

RemediationAI

Vendor-released patch available: apply the Microsoft security update that brings each build to at least the fixed version - Windows 10 1809/Server 2019 to 10.0.17763.9020, Windows 10 21H2 to 10.0.19044.7548, Windows 10 22H2 to 10.0.19045.7548, Server 2022 to 10.0.20348.5386, Windows 11 24H2 to 10.0.26100.8875 and Server 2025 to 10.0.26100.33158, Windows 11 25H2 to 10.0.26200.8875, and Windows 11 26H1 to 10.0.28000.2269 - per https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50307. Because the flaw is in the in-box TCP/IP kernel driver there is no supported configuration toggle to disable it, so patching is the only true fix; there is no vendor-published workaround. As compensating controls until patching, restrict and monitor local/interactive logon rights so fewer low-privileged accounts can run code on hosts (trade-off: does not stop an attacker who already has a foothold), and enforce least privilege plus EDR monitoring for kernel-exploitation and privilege-escalation behavior on unpatched systems (trade-off: detective, not preventive).

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CVE-2026-50307 vulnerability details – vuln.today

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