CVE-2025-32433 is a critical-severity (CVSS 10) Missing Authentication vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2025-06-09) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.
Erlang/OTP SSH Vulnerable to Pre-Authentication RCE
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2025-06-09. Federal agencies were required to remediate by 2025-06-30.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2025-32433.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2025-32433 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).
Where this sits among everything scored
Of 394,803 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.
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.
Affected Products
cloud native broadband network gatewayciscoconfd basicciscoenterprise nfv infrastructure softwareciscoinode managercisconcs 2000 shelf virtualization orchestrator firmwarecisconetwork services orchestratorciscoResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
ProDefense/CVE-2025-32433
CVE-2025-32433 https://github.com/erlang/otp/security/advisories/GHSA-37
omer-efe-curkus/CVE-2025-32433-Erlang-OTP-SSH-RCE-PoC
The vulnerability allows an attacker with network access to an Erlang/OT
NiteeshPujari/CVE-2025-32433-PoC
CVE-2025-32433 PoC: Unauthenticated Remote Code Execution (RCE) in Erlan
m0usem0use/erl_mouse
python script to find vulnerable targets of CVE-2025-32433
0xPThree/cve-2025-32433
ekomsSavior/POC_CVE-2025-32433
exa-offsec/ssh_erlangotp_rce
Exploitation module for CVE-2025-32433 (Erlang/OTP)
yonathanpy/CVE-2025-32433.py
CVE-2025-32433 PoC – SSH Protocol Python-based PoC for controlled lab te
joshuavanderpoll/cve-2025-32433
Go PoC for CVE-2025-32433 — unauthenticated RCE in Erlang/OTP SSH.
dollarboysushil/CVE-2025-32433-Erlang-OTP-SSH-Unauthenticated-RCE
PoC showing unauthenticated remote code execution in Erlang/OTP SSH serv
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Fix
Upgrade the affected component to the fixed release for CVE-2025-32433, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Frequently Asked Questions
Is CVE-2025-32433 in your dependencies?
Find it across , including transitive dependencies.