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 Server 2016
View allWindows MSHTML component contains a remote code execution vulnerability that allows attackers to craft malicious ActiveX
<p>A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged fi
Windows MSDT (Microsoft Support Diagnostic Tool) allows remote code execution when called via the ms-msdt URL protocol f
The SMBv1 server in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows
The Windows VBScript engine contains a remote code execution vulnerability in object handling that allows full system co
Windows Print Spooler Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no auth
The Win32k kernel-mode driver in Windows Vista through Windows Server 2016 allows local privilege escalation, exploited
Windows Search Remote Code Execution Vulnerability. Rated high severity (CVSS 7.5), this vulnerability is remotely explo
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
Windows Kernel contains a TOCTOU race condition vulnerability allowing local privilege escalation, exploited by the OilR
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in
Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today