CVE-2025-32433: Erlang/OTP SSH Vulnerable to Pre-Authentication RCE
First published: Wed Apr 16 2025(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Erlang/OTP | <27.3.3<26.2.5.11<25.3.2.20 | |
| debian/erlang | <=1:23.2.6+dfsg-1+deb11u1<=1:25.2.3+dfsg-1<=1:27.3.2+dfsg-1 | 1:27.3.3+dfsg-1 |
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Reference Links
- https://github.com/erlang/otp/security/advisories/GHSA-37cp-fgq5-7wc2
- https://github.com/erlang/otp/commit/0fcd9c56524b28615e8ece65fc0c3f66ef6e4c12
- https://github.com/erlang/otp/commit/6eef04130afc8b0ccb63c9a0d8650209cf54892f
- https://github.com/erlang/otp/commit/b1924d37fd83c070055beb115d5d6a6a9490b891
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-32433
- https://nvd.nist.gov/vuln/detail/CVE-2025-32433
- https://launchpad.net/bugs/cve/CVE-2025-32433
- https://security-tracker.debian.org/tracker/CVE-2025-32433
- https://ubuntu.com/security/CVE-2025-32433
- http://www.openwall.com/lists/oss-security/2025/04/16/2
- https://www.bleepingcomputer.com/news/security/critical-erlang-otp-ssh-pre-auth-rce-is-surprisingly-easy-to-exploit-patch-now/
- http://www.openwall.com/lists/oss-security/2025/04/18/1
- http://www.openwall.com/lists/oss-security/2025/04/18/2
- http://www.openwall.com/lists/oss-security/2025/04/18/6
Frequently Asked Questions
What is the severity of CVE-2025-32433?
CVE-2025-32433 is classified as a high severity vulnerability due to its potential for unauthenticated remote code execution.
How do I fix CVE-2025-32433?
To fix CVE-2025-32433, update your Erlang/OTP installation to versions 27.3.3, 26.2.5.11, or 25.3.2.20 or later.
What type of vulnerability is CVE-2025-32433?
CVE-2025-32433 is a remote code execution vulnerability that affects the SSH server functionality in Erlang/OTP.
Which versions of Erlang/OTP are affected by CVE-2025-32433?
CVE-2025-32433 affects Erlang/OTP versions prior to 27.3.3, 26.2.5.11, and 25.3.2.20.
What might happen if CVE-2025-32433 is exploited?
If CVE-2025-32433 is exploited, an attacker could execute arbitrary code on the server without authentication.
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