Vulnerability Description
Erlang/OTP is a set of libraries for the Erlang programming language. Prior to versions OTP-27.3.1, 26.2.5.10, and 25.3.2.19, a maliciously formed KEX init message can result with high memory usage. Implementation does not verify RFC specified limits on algorithm names (64 characters) provided in KEX init message. Big KEX init packet may lead to inefficient processing of the error data. As a result, large amount of memory will be allocated for processing malicious data. Versions OTP-27.3.1, OTP-26.2.5.10, and OTP-25.3.2.19 fix the issue. Some workarounds are available. One may set option `parallel_login` to `false` and/or reduce the `max_sessions` option.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/erlang/otp/security/advisories/GHSA-vvr3-fjhh-cfwc
- https://lists.debian.org/debian-lts-announce/2025/04/msg00028.html
FAQ
What is CVE-2025-30211?
CVE-2025-30211 is a vulnerability with a CVSS score of 7.5 (HIGH). Erlang/OTP is a set of libraries for the Erlang programming language. Prior to versions OTP-27.3.1, 26.2.5.10, and 25.3.2.19, a maliciously formed KEX init message can result with high memory usage. I...
How severe is CVE-2025-30211?
CVE-2025-30211 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-30211?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.