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
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated low-privileged access to the target (CVSS PR:L, AV:L) - this is a local elevation-of-privilege flaw, not remotely reachable, so it cannot be triggered across the network despite RRAS being a networking service. … 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 of low complexity requiring an existing low-privileged foothold, with high confidentiality, integrity and availability impact and no scope change - consistent with a classic local elevation-of-privilege bug. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained low-privileged code execution on a Windows host - for example via phishing, a compromised service account, or a foothold on a shared server - invokes the vulnerable RRAS code path with crafted input that overflows a heap buffer. By controlling the heap corruption they overwrite adjacent objects to hijack execution and elevate from their limited account to SYSTEM. … |
| Remediation | 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10, Windows 11, and Windows Server systems (versions 2012 R2 through 2025) in your environment and categorize by criticality with domain controllers and file servers as top priority. …
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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
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