In December 2024, Microsoft disclosed CVE-2024-49115 (popularly dubbed “MS-SNMP / Windows Remote Desktop Service RCE”), a critical Remote Code Execution vulnerability carrying a CVSS v3.1 score of 9.8 (Critical). Affecting both Windows client and Windows Server operating systems, this flaw allows unauthenticated remote attackers to execute arbitrary code or trigger kernel-level denial of service (BSOD) by transmitting specially crafted packets over the network to vulnerable Windows systems.
This technical remediation guide details the root cause mechanism of CVE-2024-49115, lists affected operating systems (including Windows Server 2025, 2022, 2019, and 2016), provides step-by-step PowerShell patching workflows, outlines Network Level Authentication (NLA) enforcement commands, and details perimeter firewall isolation strategies.
Technical root cause and attack vectors of CVE-2024-49115
The vulnerability resides in the way the Windows Remote Desktop Service and underlying network parsing libraries handle malformed remote procedure call (RPC) packets:
- Pre-Authentication Exploitability: An attacker requires zero credentials and zero user interaction to trigger the vulnerability.
- Remote Code Execution (RCE): By overflowing or corrupting internal memory buffers during connection negotiation, an attacker can hijack control flow to execute malicious payloads with
NT AUTHORITY\SYSTEMprivileges. - Wormable Potential: Because the vulnerability can be triggered over public RDP / RPC network ports, automated scanners and botnets can scan the public IPv4 space to compromise unpatched servers autonomously.
Affected Windows operating systems
| Platform | Affected Versions | Remediation Knowledge Base (KB) |
|---|---|---|
| Windows Server | 2025, 2022 (23H2 & 2022), 2019, 2016 | Install December 2024 Cumulative Update |
| Windows Client | Windows 11 (24H2, 23H2, 22H2), Windows 10 (22H2) | Install December 2024 Security Update |
Step 1: Apply official Microsoft cumulative security updates
Applying the official security patch is the primary and permanent fix. On standalone servers or headless Windows VPS instances, trigger Windows Update via elevated PowerShell:
# Install and run PSWindowsUpdate module
Install-Module -Name PSWindowsUpdate -Force -SkipPublisherCheck
Get-WindowsUpdate -Install -AcceptAll -AutoRebootAlternatively, open Settings > Update & Security > Windows Update and click Check for updates.
Step 2: Enforce Network Level Authentication (NLA) via PowerShell
Enforcing Network Level Authentication (NLA) acts as an essential mitigation layer. When NLA is active, the server forces the connecting client to authenticate with valid Windows credentials over CredSSP/Kerberos before the Remote Desktop Service initializes full graphical session buffers:
# Enforce NLA via WMI / PowerShell
(Get-WmiObject -Namespace "root\cimv2\TerminalServices" -Class "Win32_TSGeneralSetting" -Filter "TerminalName='RDP-Tcp'").SetUserAuthenticationRequired(1)
# Verify NLA is active (returns 1 for enabled)
(Get-WmiObject -Namespace "root\cimv2\TerminalServices" -Class "Win32_TSGeneralSetting" -Filter "TerminalName='RDP-Tcp'").UserAuthenticationRequiredStep 3: Isolate RDP behind hardware firewalls and VPN
Exposing default RDP port 3389 directly to the public internet makes servers constant targets for automated vulnerability scanners:
- Datacenter Hardware Firewall: In your Aminserve Server Management panel, restrict inbound traffic to port
3389to your static office IP or dedicated management VPN subnet. - Deploy WireGuard / OpenVPN: Require remote administrators to connect through an encrypted VPN tunnel before accessing remote desktop services.
- Account Lockout Thresholds: Prevent brute-force password guessing by enforcing an account lockout threshold of 5 invalid attempts via
secpol.msc(Account Policies > Account Lockout Policy).
Step 4: Audit Event Viewer security logs for compromise attempts
Inspect your Windows Security event logs to verify connection integrity:
- Event ID 4624 (Successful Logon): Check logon type
10(RemoteInteractive) for unauthorized user accounts. - Event ID 4625 (Failed Logon): Review spikes in failed authentication attempts originating from unfamiliar external IP addresses.
- TerminalServices-LocalSessionManager Log: Inspect
Applications and Services Logs > Microsoft > Windows > TerminalServices-LocalSessionManager > Operationalfor connection source addresses.
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