EUVD-2026-44089
GHSA-8c44-h2jq-c85w
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 session (AV:L, PR:L), low complexity and no user interaction, with full C/I/A impact from privilege elevation to SYSTEM.
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 Web Proxy Auto-Discovery Protocol (WPAD) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Web Proxy Auto-Discovery (WPAD) service affects Windows 10 Version 1607 and Windows Server 2012, 2012 R2, and 2016 (including Server Core installations), where a heap-based buffer overflow (CWE-122) lets an authenticated local attacker corrupt kernel/service heap memory and elevate to higher privileges. Microsoft has released a patch and reported the flaw itself; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess valid low-privileged local access to the target host (CVSS PR:L, AV:L) and the ability to reach and trigger the Windows WPAD / auto-proxy-discovery code path; no user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.8) describes a locally-exploitable, low-complexity elevation of privilege requiring an attacker to already hold low-privileged access on the host, with no user interaction and full confidentiality, integrity, and availability impact once triggered. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged foothold on an affected Windows Server 2016 or Server 2012 R2 host - for example via phishing, a compromised service account, or stolen credentials - triggers the WPAD component to process crafted proxy-discovery data, overflowing a heap buffer. By grooming the heap and corrupting adjacent structures, they hijack execution in the higher-privileged service context to escalate toward SYSTEM. … |
| Remediation | Patch available per vendor advisory: Microsoft has released fixes for the affected SKUs, so the primary action is to install the corresponding monthly security update (KB) for each affected system via Windows Update or WSUS, prioritizing multi-user and internet-adjacent hosts. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and document all Windows 10 Version 1607 and Windows Server 2012, 2012 R2, and 2016 systems in the environment; retrieve the specific patch version from Microsoft's security advisory and begin non-production testing. …
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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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