CVE-2025-32433 PoC — Erlang/OTP SSH Vulnerable to Pre-Authentication RCE

Source

https://github.com/vigilante-1337/CVE-2025-32433

Associated Vulnerability

Title:Erlang/OTP SSH Vulnerable to Pre-Authentication RCE (CVE-2025-32433)
Description:Erlang/OTP is a set of libraries for the Erlang programming language. Prior to versions OTP-27.3.3, OTP-26.2.5.11, and OTP-25.3.2.20, a SSH server may allow an attacker to perform unauthenticated remote code execution (RCE). By exploiting a flaw in SSH protocol message handling, a malicious actor could gain unauthorized access to affected systems and execute arbitrary commands without valid credentials. This issue is patched in versions OTP-27.3.3, OTP-26.2.5.11, and OTP-25.3.2.20. A temporary workaround involves disabling the SSH server or to prevent access via firewall rules.

Description

A critical flaw has been discovered in Erlang/OTP's SSH server allows unauthenticated attackers to gain remote code execution. One malformed SSH handshake bypasses authentication and exploits improper handling of SSH protocol messages.

Readme

# CVE-2025-32433: Erlang/OTP's SSH Server Exploit
_______________________________
![ScreenShot](https://github.com/vigilante-1337/CVE-2025-32433/raw/main/static/CVE-2025-32433.png) 


## Information
CVE-2025-32433: A critical flaw has been discovered in Erlang/OTP's SSH server allows 
unauthenticated attackers to gain remote code execution. One malformed SSH handshake 
bypasses authentication and exploits improper handling of SSH protocol messages.

##
Affected Version:
----------------
- <= OTP-27.3.2
- <= OTP-26.2.5.10
- <= OTP-25.3.2.19
##

## Installation
You should first install the vulnerable lab, theres a guide on the [Docker](https://github.com/vigilante-1337/CVE-2025-32433/blob/main/Docker/setup) folder
```bash
~$ git clone https://github.com/vigilante-1337/CVE-2025-32433
~$ cd CVE-2025-32433
~$ chmod +x exploit
~$ exploit
```

File Snapshot


 [4.0K]  /data/pocs/f5255f0450832c24e539615fdf9fb90000cc871e
├── [4.0K]  Docker
│   └── [1.5K]  setup
├── [ 12K]  exploit
├── [ 848]  README.md
└── [4.0K]  static
    ├── [ 45K]  affected-version.png
    └── [102K]  CVE-2025-32433.png

2 directories, 5 files

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