CVE-2025-32433

Name	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4132-1, DSA-5906-1
Debian Bugs	1103442

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
erlang (PTS)	bullseye	1:23.2.6+dfsg-1+deb11u1	vulnerable
	bullseye (security)	1:23.2.6+dfsg-1+deb11u2	fixed
	bookworm	1:25.2.3+dfsg-1+deb12u3	fixed
	bookworm (security)	1:25.2.3+dfsg-1+deb12u1	fixed
	trixie	1:27.3.4.1+dfsg-1	fixed
	forky, sid	1:27.3.4.3+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
erlang	source	bullseye	1:23.2.6+dfsg-1+deb11u2	DLA-4132-1
erlang	source	bookworm	1:25.2.3+dfsg-1+deb12u1	DSA-5906-1
erlang	source	(unstable)	1:27.3.3+dfsg-1		1103442

Notes

https://github.com/erlang/otp/security/advisories/GHSA-37cp-fgq5-7wc2
https://github.com/erlang/otp/commit/0fcd9c56524b28615e8ece65fc0c3f66ef6e4c12 (OTP-25.3.2.20)
https://github.com/erlang/otp/commit/b1924d37fd83c070055beb115d5d6a6a9490b891 (OTP-26.2.5.11)
https://github.com/erlang/otp/commit/6eef04130afc8b0ccb63c9a0d8650209cf54892f (OTP-27.3.3)
https://www.openwall.com/lists/oss-security/2025/04/18/2