EUVD-2026-44275
GHSA-cwgv-p83h-qw6w
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring an existing low-privileged account (AV:L, PR:L), low-complexity heap overflow with no user interaction yielding full SYSTEM compromise (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows Routing and Remote Access Service (RRAS) allows an authenticated low-privileged attacker to elevate to SYSTEM by triggering a heap-based buffer overflow (CWE-122). The flaw affects a broad range of Windows client and server versions from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 R2 through Server 2025. There is no public exploit identified at time of analysis, and it is not listed in CISA KEV; a vendor patch is available.
Technical ContextAI
RRAS is the Windows component providing routing, dial-up, VPN and NAT services, implemented across kernel and user-mode service code that parses network/configuration data structures. The root cause is CWE-122 (heap-based buffer overflow), meaning attacker-influenced input causes a write past the bounds of a heap-allocated buffer, corrupting adjacent heap metadata or object pointers. Controlled heap corruption of this kind is a well-established primitive for hijacking control flow or overwriting security-relevant objects to gain code execution in a higher-privileged context. The CPE data confirms this is a Microsoft Windows operating system component (microsoft:windows_*), spanning 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.
RemediationAI
Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-57096 to all affected Windows client and server systems, using the per-version fixed builds listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57096. As a compensating control until patching completes, disable the Routing and Remote Access Service (services.msc / 'Stop-Service RemoteAccess' and set startup to Disabled) on systems that do not require VPN, dial-up, routing or NAT functionality, which removes the vulnerable attack surface at the cost of losing those routing/VPN capabilities on affected hosts. Where RRAS is required, restrict and monitor local low-privileged access to reduce the pool of accounts able to reach the vulnerable code path, since exploitation requires an existing local foothold. Exact fixed version numbers should be taken directly from the MSRC update guide rather than assumed.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
Leaving vuln.today