Windows NTFS Heap-Based Buffer Overflow Vulnerability (CVE-2025-24993) Technical Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTSystems running Windows Operating Systems utilizing the NTFS file system driver (ntfs.sys)
A local authorized attacker can exploit this vulnerability to trigger a heap-based buffer overflow, leading to local privilege escalation (LPE) and arbitrary code execution with SYSTEM privileges
Immediately apply the latest Microsoft cumulative security updates and restrict the mounting of untrusted external storage media and disk images
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Deploy the latest cumulative updates via Windows Update or Windows Server Update Services (WSUS). You can force the update installation using PowerShell.
# Install Windows Update module and apply the latest security patches
Install-Module PSWindowsUpdate -Force -SkipPublisherCheck
Get-WindowsUpdate -KBArticleID KB5049228, KB5049232 -Install -AcceptAll -AutoReboot2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, disable the automatic mounting of virtual disk images and restrict USB storage devices to mitigate the attack vector.
# Disable default file association for ISO and VHD/VHDX files
Remove-ItemProperty -Path 'HKLM:\SOFTWARE\Classes\.iso' -Name 'PerceivedType' -ErrorAction SilentlyContinue
Remove-ItemProperty -Path 'HKLM:\SOFTWARE\Classes\.vhd' -Name 'PerceivedType' -ErrorAction SilentlyContinue
Remove-ItemProperty -Path 'HKLM:\SOFTWARE\Classes\.vhdx' -Name 'PerceivedType' -ErrorAction SilentlyContinue
# Disable USB Storage driver to prevent physical vector exploitation
Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Services\USBSTOR' -Name 'Start' -Value 43. Log Audit & IoC Verification Commands
Verify the current version of ntfs.sys and inspect the Windows Event Logs for suspicious virtual disk mounting activities.
# Check the file version of ntfs.sys
$NtfsPath = '$env:windir\System32\drivers\
tfs.sys'
$NtfsVersion = (Get-Item $NtfsPath).VersionInfo.FileVersion
Write-Host 'Current NTFS.sys Version:' $NtfsVersion
# Query Event Logs for virtual disk mount events (Event ID 12 - VHDMP)
Get-WinEvent -FilterHashtable @{LogName='System'; ProviderName='Microsoft-Windows-VHDMP'} -ErrorAction SilentlyContinue |
Select-Object TimeCreated, Id, Message | Format-Table -AutoSizeBlock Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2025-24993) is a heap-based buffer overflow (CWE-122) residing in the Windows NTFS file system driver (ntfs.sys). The root cause lies in insufficient input validation when the NTFS driver parses malformed file system metadata structures or file attribute records. This lack of boundary checks allows an attacker to overwrite adjacent memory blocks within the kernel pool.
2. Exploitation Mechanics & Attack Scenario
An attacker with local access can craft a malicious NTFS volume or virtual disk image (such as .vhdx or .iso) containing corrupted Master File Table (MFT) records or attribute lists. When a user or an automated system process mounts and accesses this crafted volume, the parsing routine in ntfs.sys triggers a buffer overflow in the kernel heap. By carefully structuring the overflow payload, the attacker can overwrite critical kernel objects to hijack execution flow and elevate privileges to NT AUTHORITY\SYSTEM.
3. Infrastructure & Business Impact
As this vulnerability is actively exploited in the wild and listed in the CISA KEV catalog, it poses an immediate threat to enterprise environments. Successful exploitation bypasses standard endpoint detection and response (EDR) agents, allowing attackers to establish persistence, dump credentials, and deploy ransomware across the network.
Official Vendor Advisories & References
Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code locally.
Frequently Asked SecOps Questions (CVE-2025-24993)
FAQQ1. How critical is CVE-2025-24993 and is it actively exploited in the wild?
CVE-2025-24993 is rated CVSS 7.8 (HIGH) with a 30-day EPSS exploitation probability of 2.2%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2025-24993?
Primary impacted vendors include microsoft across windows, ntfs. Scope summary: All supported versions of Windows 10, Windows 11, and Windows Server utilizing the NTFS driver
Q3. What temporary mitigations or workarounds exist for CVE-2025-24993 before patching?
[Mitigation] Immediately apply the latest Microsoft cumulative security updates and restrict the mounting of untrusted external storage media and disk images Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2025-24993
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
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