EUVD-2026-44294
GHSA-ccw5-f6hp-583h
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local use-after-free EoP requiring an existing low-privilege foothold (AV:L, PR:L), low complexity and no user interaction, yielding full SYSTEM-level compromise (C:H/I:H/A:H) without scope change.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Use after free in Microsoft NAT Helper Components (ipnathlp.dll) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft's NAT Helper Components (ipnathlp.dll), the driver behind Internet Connection Sharing and NAT translation on Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025. An authenticated attacker who already has low-privilege access can exploit a use-after-free memory corruption bug to run code at higher privilege (SYSTEM). …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated low-privilege access (CVSS PR:L, AV:L) to a host running an affected Windows 11 24H2/25H2/26H1 or Windows Server 2025 build with the NAT Helper component (ipnathlp.dll) present. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (base 7.8, High) describes a locally exploitable flaw requiring only low privileges and no user interaction, with high confidentiality, integrity and availability impact but no scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained low-privileged code execution on a Windows 11 or Server 2025 host - for example via a phished user account or a compromised low-privilege service - triggers the use-after-free in ipnathlp.dll to corrupt memory and elevate to SYSTEM. Because the CVSS vector is AV:L/AC:L/PR:L/UI:N, no victim interaction is needed and the attack is low-complexity, though it does require prior local access. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-58537 documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58537, selecting the KB that matches each affected SKU (Windows 11 24H2/25H2/26H1 and Windows Server 2025 including Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 systems and assess which have multiple local users or remote-access capabilities. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 11 Version 24H2
View allLocal privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-a
Local privilege escalation in the Windows Kernel lets an already-authenticated attacker corrupt kernel memory via a use-
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Local code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and s
Elevation of privilege in the Windows NTFS file-system driver lets an already-authenticated local user escalate to SYSTE
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Local privilege escalation in the Microsoft Windows Kernel allows an already-authenticated attacker to elevate to SYSTEM
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthoriz
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary co
Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
View allShare
External POC / Exploit Code
Leaving vuln.today