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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.07%
Affected: erlang otp
Published at:
Updated at:

References

Link Tags
https://github.com/erlang/otp/security/advisories/GHSA-vvr3-fjhh-cfwc

Frequently Asked Questions

What is the severity of CVE-2025-30211?
CVE-2025-30211 has been scored as a high severity vulnerability.
How to fix CVE-2025-30211?
To fix CVE-2025-30211, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-30211 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-30211 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-30211?
CVE-2025-30211 affects erlang otp.
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