EUVD-2025-17787CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
6DescriptionNVD
Integer overflow or wraparound in Windows SMB allows an authorized attacker to elevate privileges locally.
AnalysisAI
CVE-2025-32718 is an integer overflow vulnerability in Windows SMB that allows a locally authenticated attacker to achieve privilege escalation with high impact to confidentiality, integrity, and availability. The vulnerability affects Windows operating systems' SMB implementation and has a CVSS score of 7.8 (High) with low attack complexity, making it a significant local privilege escalation risk for multi-user systems and domain environments.
Technical ContextAI
This vulnerability exists in the Windows Server Message Block (SMB) protocol implementation, specifically involving an integer overflow or wraparound condition classified under CWE-122 (Heap-based Buffer Overflow). Integer overflows in SMB can occur during buffer size calculations, packet parsing, or memory allocation operations. When an attacker-controlled value is used in arithmetic operations without proper bounds checking, it can wrap around to a small positive value, bypassing size validations and leading to heap buffer overflows. The SMB protocol (TCP ports 445/139) is fundamental to Windows file sharing, network authentication, and inter-process communication, making any flaw here broadly impactful across Windows infrastructure.
RemediationAI
Apply the official Microsoft security patch when released for affected Windows versions. Interim mitigations include: (1) Restrict local user access and enforce principle of least privilege—disable unnecessary local accounts and remove standard users from sensitive systems; (2) Implement application whitelisting and AppLocker policies to restrict execution of potential exploit payloads; (3) Enable Windows Defender Exploit Guard features (Control Flow Guard, Address Space Layout Randomization); (4) Monitor SMB traffic and disable SMB v1 if not required; (5) Apply network segmentation to isolate high-value systems; (6) Enforce multi-factor authentication for domain accounts to limit lateral movement post-exploitation. Patch availability and version numbers will be provided in Microsoft Security Advisories—monitor Microsoft Security Response Center (MSRC) for official bulletin.
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