EUVD-2026-44259
GHSA-7x4x-wrp3-r2gg
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable EoP needing an authenticated low-priv account (PR:L), no user interaction, low complexity, with full high C/I/A impact and no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Integer overflow or wraparound in Windows Remote Access Service Infrastructure allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in the Windows Remote Access Service (RRAS) Infrastructure allows an authenticated attacker to elevate privileges over the network by triggering an integer overflow (CWE-190) in affected code paths. The flaw affects a broad range of Windows 10, Windows 11, and Windows Server releases (2012 R2 through 2025), and Microsoft has released a patch. There is no public exploit identified at time of analysis and the issue is not listed in CISA KEV, but the network-reachable EoP profile with only low privileges required makes it a meaningful patch priority.
Technical ContextAI
The vulnerability resides in the Windows Remote Access Service Infrastructure (RRAS), the Microsoft component providing routing, VPN, dial-up, and NAT services on Windows client and server platforms. The root cause is CWE-190 (Integer Overflow or Wraparound), corroborated by the vendor tags 'Integer Overflow' and 'Buffer Overflow': arithmetic on an attacker-influenced length or count value wraps around, producing an undersized allocation or an out-of-bounds condition that corrupts memory and ultimately yields elevated execution context. The CPE data confirms the affected code ships across Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012 R2, 2016, 2019, 2022, and 2025, including Server Core installations, indicating the defect lives in shared, long-lived RRAS infrastructure rather than a single edition.
RemediationAI
Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-56647 as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56647, selecting the KB matching each affected Windows 10/11 or Windows Server build. As a compensating control where patching must be delayed, disable the Routing and Remote Access Service (RRAS) on hosts that do not require VPN/routing/NAT functionality, since the vulnerable code is only reachable where RRAS is enabled - the trade-off is loss of any VPN, dial-up, or software routing that host provides. Additionally restrict network access to RRAS management and service interfaces to trusted administrative segments and require authenticated, least-privilege accounts, which raises the bar given the PR:L exploitation requirement; the side effect is tighter access boundaries for legitimate remote-access operators.
More in Windows 10 Version 1607
View allRemote code execution in Windows IKE Extension (Internet Key Exchange) via double free memory corruption allows unauthen
Local privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Windows Shell protection mechanism failure (CVE-2026-32202) allows remote attackers to perform spoofing attacks over a n
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Local privilege escalation via heap-based buffer overflow in the Windows Message Queuing (MSMQ) Queue Manager component
Local privilege escalation in Microsoft Windows Win32K lets an authenticated low-privileged user corrupt kernel heap mem
Local privilege escalation in the Windows NTFS file system driver lets an authenticated low-privileged user win a race c
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today