CVE-2024-38233: Windows 10 1607 DoS Vulnerability

CVE-2024-38233 Overview

CVE-2024-38233 is a denial of service vulnerability in the Microsoft Windows networking stack. The flaw affects Windows 10 version 1607 and Windows Server 2016, allowing unauthenticated remote attackers to disrupt service availability over the network. The vulnerability is tracked under [CWE-476] (NULL Pointer Dereference), indicating that crafted network traffic triggers a null pointer condition in kernel networking code. Microsoft addressed the issue in the September 2024 Patch Tuesday cycle.

Critical Impact
A remote, unauthenticated attacker can send specially crafted network packets to trigger a null pointer dereference, causing Windows hosts to become unresponsive or crash. The EPSS score of 13.6% places this vulnerability in the 94th percentile for exploitation likelihood.

Affected Products

Microsoft Windows 10 Version 1607 (x64)
Microsoft Windows Server 2016
Systems running unpatched Windows networking components as of September 2024

Discovery Timeline

2024-09-10 - CVE-2024-38233 published to NVD as part of Microsoft's September 2024 Patch Tuesday
2024-09-17 - Last updated in NVD database

Technical Details for CVE-2024-38233

Vulnerability Analysis

The vulnerability resides in Windows networking components that process incoming network traffic. It is classified as a null pointer dereference [CWE-476], a memory safety defect where code accesses a pointer that has not been initialized or has been set to null. When the affected code path is reached through crafted network input, the dereference triggers an exception in kernel context, halting the affected service or the operating system.

Microsoft categorizes this as a denial of service condition with no confidentiality or integrity impact. Successful exploitation does not yield code execution or data disclosure. Instead, it disrupts the availability of network-dependent services on the targeted host. The attack requires no user interaction and no prior authentication.

Root Cause

The defect originates in a Windows networking code path that fails to validate a pointer before dereferencing it. When attacker-supplied network data reaches the vulnerable function, the unchecked pointer is accessed and the host enters an error state. Microsoft has not published the specific protocol handler or function name in the public advisory.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker on the same network segment, or with the ability to deliver packets to an exposed Windows networking service, can transmit the malicious payload. Hosts exposing affected networking services to untrusted networks face the highest risk.

No public proof-of-concept code or exploit module has been released, and the vulnerability is not listed on the CISA Known Exploited Vulnerabilities catalog. See the Microsoft CVE-2024-38233 Update for vendor details.

Detection Methods for CVE-2024-38233

Indicators of Compromise

Unexpected system reboots or bugcheck (BSOD) events on Windows Server 2016 or Windows 10 1607 hosts following inbound network activity
Sudden loss of network service availability without corresponding administrative action
Windows Event Log entries referencing kernel-mode exceptions in networking drivers

Detection Strategies

Monitor Windows Event IDs 1001 (BugCheck) and 41 (Kernel-Power) for unexpected crashes on affected systems
Correlate inbound network traffic spikes with system crash events to identify potential exploitation attempts
Use network intrusion detection signatures to flag malformed packets targeting Windows networking services

Monitoring Recommendations

Inventory all Windows 10 1607 and Windows Server 2016 hosts and confirm September 2024 security update status
Track availability metrics for network-facing services on legacy Windows hosts
Enable kernel crash dump collection to support forensic analysis of suspected DoS attempts

How to Mitigate CVE-2024-38233

Immediate Actions Required

Apply the Microsoft September 2024 security update to all Windows 10 1607 and Windows Server 2016 systems
Restrict inbound network access to affected hosts using host-based and perimeter firewalls until patches are deployed
Prioritize remediation on internet-facing or DMZ-resident Windows Server 2016 hosts

Patch Information

Microsoft released the fix as part of the September 2024 Patch Tuesday release. Administrators should consult the Microsoft CVE-2024-38233 Update advisory for the corresponding KB article applicable to their Windows build and apply it through Windows Update, WSUS, or Microsoft Update Catalog.

Workarounds

Limit exposure of Windows networking services to trusted network segments using firewall rules
Disable or block unused Windows networking protocols on affected hosts where operationally feasible
Segment legacy Windows Server 2016 systems away from untrusted networks pending patch deployment

bash

# Example: Restrict inbound traffic on affected Windows host using PowerShell
New-NetFirewallRule -DisplayName "Block-Untrusted-Inbound" `
  -Direction Inbound `
  -Action Block `
  -RemoteAddress 0.0.0.0/0 `
  -Profile Any

# Verify September 2024 update installation
Get-HotFix | Where-Object { $_.InstalledOn -ge "09/10/2024" }