EUVD-2026-44020
GHSA-pr9w-vppj-jx9w
Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Adjacent-network unauthenticated RCE with full impact, but AC:H because winning the CWE-362 race window requires precise timing and repeated attempts.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an unauthorized attacker to execute code over an adjacent network.
AnalysisAI
Remote code execution in the Microsoft Windows TCP/IP networking stack allows an unauthenticated attacker on the same physical or logical network segment to win a race condition and run arbitrary code on the target. The flaw spans a broad range of desktop and server builds from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must have adjacent-network access (AV:A) - a position on the same physical/logical link, LAN, or VLAN as the target - and cannot exploit this across a routed internet path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, base 8.8) describes an adjacent-network, low-complexity, unauthenticated attack with full confidentiality, integrity, and availability impact - a serious profile for a kernel network component. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has gained a foothold on a device in the same LAN segment - for example a compromised workstation, a rogue device on an open Ethernet port, or a machine on the same VLAN - sends a carefully timed sequence of crafted packets to a target's TCP/IP stack. By repeatedly racing the vulnerable synchronization window, the attacker corrupts kernel memory and executes code with kernel privileges, requiring no credentials or user interaction. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for your specific Windows/Windows Server build as listed in the MSRC update guide (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54999); the exact fixed KB/build number is not reproduced in the input data, so pull it per-edition from the advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of Windows systems in your environment to identify those running Windows 10 (1607 through current), Windows 11 (all versions through 26H1), or Windows Server 2012 through 2025, and categorize by business criticality. …
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Same weakness CWE-362 – Race Condition
View allSame technique Authentication Bypass
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External POC / Exploit Code
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