In this post, we will be discussing a crucial security vulnerability, CVE-2022-41039, that affects the Windows Point-to-Point Tunneling Protocol (PPTP). It is a remote code execution vulnerability that can be exploited by malicious actors to compromise the targeted systems. This issue is distinct from CVE-2022-41044 and CVE-2022-41088, but it also poses a severe risk if left unpatched. We will cover the technical details of this vulnerability, along with a sample code snippet and links to the original sources for reference.


Windows PPTP is a network protocol that allows secure communication between remote clients and servers by creating a VPN connection. Unfortunately, the implementation of PPTP in certain Windows versions contains a flaw that can be exploited by attackers to execute arbitrary code on the target system.

Official references for this vulnerability

- Microsoft Security Advisory
- National Vulnerability Database (NVD)

Exploit Details

The vulnerability exists due to an issue in the way Windows PPTP handles specially crafted packets. With this flaw, an attacker can send a specifically crafted packet to a vulnerable system and trigger a buffer overflow. This buffer overflow can lead to remote code execution with elevated privileges, effectively giving the attacker full control over the system.

A simplified example of the exploit code, which demonstrates the concept of this vulnerability

import socket

def exploit(target: str, port: int):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect((target, port))

    # Craft a malicious packet
    packet = b"\x00" * 1024  # Example payload - 1024 null bytes

        # Send the malicious packet
        print(f"[*] Sending malicious packet to {target}:{port}")
    except Exception as e:
        print(f"[-] Error occurred: {e}")

if __name__ == "__main__":
    target = ""  # Target IP address
    port = 1723  # PPTP port

    exploit(target, port)

Please note that the above code snippet is for educational purposes only and should not be used for any malicious activity.


To protect against this vulnerability, it is essential to apply the relevant security patches provided by Microsoft. Users should download and install the updates as soon as possible to protect systems from potential attacks.

Monitor traffic for anomalies indicating the presence of exploit attempts.

3. Deploy Intrusion Detection Systems (IDS) or Intrusion Prevention Systems (IPS) to detect and block exploit attempts.


CVE-2022-41039 is a critical vulnerability that affects the Windows PPTP implementation. Malicious actors can exploit this issue to perform remote code execution on the targeted system, potentially compromising the entire system. To mitigate the risk associated with this vulnerability, it is crucial to apply the necessary security patches provided by Microsoft and adhere to the recommended best practices.

Stay safe, and make sure to patch and update your systems regularly!


Published on: 11/09/2022 22:15:00 UTC
Last modified on: 11/10/2022 00:33:00 UTC