CVE-2025-32433 — Erlang Erlang/OTP SSH Server Missing Authentication for Critical Function Vulner
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,
Published
2025-04-16T21:34:37.457Z
Last modified
2026-02-26T18:28:12.084Z
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA KEV — Actively Exploited
01What is this vulnerability?
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…
02Affected products
| Vendor | Product | Versions |
|---|
| erlang | otp | >= OTP-27.0-rc1, < OTP-27.3.3, >= OTP-26.0-rc1, < OTP-26.2.5.11, < OTP-25.3.2.20 |
03Active exploitation status
Yes — actively exploited. Added to the CISA KEV catalog on 2025-06-09. Ransomware use: Unknown.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
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07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2025-04-16T21:34:37.457Z
- Last modified: 2026-02-26T18:28:12.084Z
- Added to CISA KEV: 2025-06-09
- BOD 22-01 due: 2025-06-30
09References
- github.com — https://github.com/erlang/otp/security/advisories/GHSA-37cp-fgq5-7wc2
- github.com — https://github.com/erlang/otp/commit/0fcd9c56524b28615e8ece65fc0c3f66ef6e4c12
- github.com — https://github.com/erlang/otp/commit/6eef04130afc8b0ccb63c9a0d8650209cf54892f
- github.com — https://github.com/erlang/otp/commit/b1924d37fd83c070055beb115d5d6a6a9490b891
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