CVE-2024-38232 Overview
CVE-2024-38232 is a denial of service vulnerability in the Windows networking stack affecting Microsoft Windows 10 1607 and Windows Server 2016. The flaw is categorized under [CWE-476] (NULL Pointer Dereference) and can be triggered remotely over the network without authentication or user interaction. A successful attack causes loss of availability on the targeted host. Microsoft published the advisory on September 10, 2024, as part of the monthly security update cycle.
Critical Impact
Remote unauthenticated attackers can crash or disrupt Windows networking services, causing service outages on affected Windows 10 1607 and Windows Server 2016 systems.
Affected Products
- Microsoft Windows 10 Version 1607 (x64)
- Microsoft Windows Server 2016
- Systems exposing Windows networking services to untrusted networks
Discovery Timeline
- 2024-09-10 - CVE-2024-38232 published to NVD and Microsoft releases security patch
- 2024-09-17 - Last updated in NVD database
Technical Details for CVE-2024-38232
Vulnerability Analysis
The vulnerability resides within the Windows networking subsystem on Windows 10 1607 and Windows Server 2016. Microsoft classifies it as a denial of service issue, and NVD maps the root weakness to [CWE-476], a NULL pointer dereference. An attacker can send crafted network traffic to a vulnerable host and force the affected component to dereference a NULL pointer. The result is a process or kernel-level fault that disrupts networking availability on the target. EPSS currently rates the exploit probability at 13.614% (94th percentile), indicating elevated predictive likelihood of exploitation activity compared to typical CVEs.
Root Cause
The defect is a NULL pointer dereference inside a network-facing code path. The vulnerable component fails to validate that a pointer is non-NULL before accessing the underlying structure during packet or request processing. When the unchecked pointer is referenced, the operating system raises an access violation that terminates the responsible thread or component. Microsoft has not published low-level technical specifics in the public advisory.
Attack Vector
The attack vector is network-based with low complexity. No privileges and no user interaction are required, per the CVSS metrics published by Microsoft. An attacker sends a specifically crafted network message to a service on the target host that processes the malformed input through the vulnerable code path. The vulnerability impacts availability only — confidentiality and integrity are not affected. See the Microsoft CVE-2024-38232 Advisory for vendor guidance.
Detection Methods for CVE-2024-38232
Indicators of Compromise
- Unexpected crashes, bugchecks, or restarts of Windows networking services on Windows 10 1607 or Windows Server 2016 hosts
- Repeated Service Control Manager events indicating networking-related services entering a stopped or restarting state
- Sudden loss of network connectivity correlated with inbound traffic from untrusted sources
Detection Strategies
- Correlate Windows Event Logs (System and Application) for crash and restart events tied to networking components
- Monitor for repeated SMB, RPC, or other Windows networking protocol traffic from a single source preceding a service crash
- Inspect Windows Error Reporting and minidump artifacts for NULL pointer dereference faults in networking modules
Monitoring Recommendations
- Forward Windows Security, System, and crash telemetry to a centralized log platform for correlation
- Alert on availability anomalies affecting domain controllers and file servers running Windows Server 2016
- Track inbound network protocol volume to legacy Windows hosts and baseline normal traffic patterns
How to Mitigate CVE-2024-38232
Immediate Actions Required
- Apply the September 2024 Microsoft security updates to all Windows 10 1607 and Windows Server 2016 systems
- Inventory legacy Windows hosts and prioritize patching for internet-exposed and edge systems
- Restrict inbound network access to Windows networking services from untrusted networks using host and perimeter firewalls
Patch Information
Microsoft addressed CVE-2024-38232 in the September 10, 2024 security updates. Administrators should consult the Microsoft CVE-2024-38232 Advisory for the specific KB articles applicable to each affected build and deploy them through Windows Update, WSUS, or Microsoft Update Catalog.
Workarounds
- Segment Windows Server 2016 and Windows 10 1607 hosts behind firewalls that restrict access to authorized peers only
- Disable unused networking services and protocols on affected hosts to reduce the attack surface
- Plan migration away from Windows 10 1607 and Windows Server 2016 to currently supported releases that receive timely security maintenance
# Configuration example: restrict inbound SMB to trusted subnets on Windows Server 2016
New-NetFirewallRule -DisplayName "Restrict SMB Inbound" `
-Direction Inbound `
-Protocol TCP `
-LocalPort 445 `
-RemoteAddress 10.0.0.0/8 `
-Action Allow
New-NetFirewallRule -DisplayName "Block SMB From Untrusted" `
-Direction Inbound `
-Protocol TCP `
-LocalPort 445 `
-Action Block
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
