EUVD-2026-73589
GHSA-v2fm-7x83-6gx9
Severity by source
AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Network-reachable EFS RPC requires authenticated low-privilege caller (PR:L, AV:N); heap overflow exploitation demands precise preconditions (AC:H); user interaction needed to trigger EFS code path (UI:R); full C/I/A impact reflects successful privilege escalation outcome.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Encrypting File System (EFS) allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Heap-based buffer overflow in the Windows Encrypting File System (EFS) service enables a low-privileged authenticated attacker to elevate privileges to a higher level over a network connection. The vulnerability (CWE-122) spans virtually the entire supported Windows ecosystem - from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025 - making it a broad enterprise patching obligation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) a valid low-privilege network account on or trusted by the target system (PR:L - unauthenticated exploitation is not possible); (2) user interaction from a session user on the target, likely triggering an EFS file access operation (UI:R); (3) high attack complexity (AC:H), implying specific heap layout preconditions or timing requirements must be satisfied. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.1 (AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H) reflects a meaningful but non-trivial exploitation path. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's cumulative security updates to bring affected systems to or above the following fixed build thresholds: Windows 11 24H2 and 25H2 → 10.0.26100.9445, Windows 11 26H1 → 10.0.28000.2954, Windows 11 23H2 → 10.0.22631.7582, Windows 10 22H2 → 10.0.19045.7725, Windows 10 21H2 → 10.0.19044.7725, Windows 10 1809 → 10.0.17763.9245, Windows 10 1607 → 10.0.14393.9512, Windows Server 2025 → 10.0.26100.33438, Windows Server 2022 → 10.0.20348.5622, Windows Server 2019 → 10.0.17763.9245, Windows Server 2016 → 10.0.14393.9512, Windows Server 2012 R2 → 6.3.9600.23397, Windows Server 2012 → 6.2.9200.26349. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory Windows systems across your organization and identify which run Windows Server 2012 through 2025 and Windows 10 through Windows 11 26H1; prioritize systems with critical data or high-privileged service accounts and establish a change management window with your infrastructure team. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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