CVE-2025-30211: KEX init error results with excessive memory usage
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.
Classification
CVE ID: CVE-2025-30211
CVSS Base Severity: HIGH
CVSS Base Score: 7.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Problem Types
CWE-789: Memory Allocation with Excessive Size ValueAffected Products
Vendor: erlang
Product: otp
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 16.39% (scored less or equal to compared to others)
EPSS Date: 2025-04-20 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-30211https://github.com/erlang/otp/security/advisories/GHSA-vvr3-fjhh-cfwc