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Fencer Vulns
high 7.5

CVE-2025-30211 json

KEX init error results with excessive memory usage

published 2025-03-28 19 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-14809

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

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.

Patch / fix

  • erlang erlang/otp 25.3.2.19, 26.2.5.10, 27.3.1
  • erlang Debian 12 1:25.2.3+dfsg-1+deb12u1
  • erlang Debian 14, Debian 13 1:27.3.1+dfsg-1

debian advisories DEBIAN-CVE-2025-30211

  • erlang Ubuntu 20.04 LTS 1:22.2.7+dfsg-1ubuntu0.4
  • erlang Ubuntu 22.04 LTS 1:24.2.1+dfsg-1ubuntu0.3
  • erlang Ubuntu 24.04 LTS 1:25.3.2.8+dfsg-1ubuntu4.2
  • erlang Ubuntu 25.10 1:27.3+dfsg-1ubuntu1
  • erlang Ubuntu Pro 14.04 LTS 1:16.b.3-dfsg-1ubuntu2.2+esm3
  • erlang Ubuntu Pro 16.04 LTS 1:18.3-dfsg-1ubuntu3.1+esm4
  • erlang Ubuntu Pro 18.04 LTS 1:20.2.2+dfsg-1ubuntu2+esm4

ubuntu advisories UBUNTU-CVE-2025-30211

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • erlang26 SLE Module for Server Applications 15 SP6, openSUSE Leap 15.6 26.2.1-150300.7.11.1

suse advisories SUSE-SU-2025:1356-1

  • erlang CBL-Mariner 2.0 25.3.2.20-1
  • erlang Azure Linux 3.0 26.2.5.10-1

azure linux advisories AZL-59350AZL-59358

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-30211 updated cvss 7.5

erlang: KEX init error results with excessive memory usage

  • Red Hat OpenStack Platform 16.2 erlang, erlang-ssl, erlang-asn1, erlang-erts, erlang-hipe, erlang-sasl, +15 more Red Hat OpenStack Platform 17.1 erlang, erlang-ssl, erlang-asn1, erlang-erts, erlang-sasl, erlang-snmp, +14 more Red Hat OpenStack Platform 18.0 erlang
    not affected: inline mitigations already exist

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • erlang otp

Classification

Weakness
  • CWE-789 Memory Allocation with Excessive Size Value

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.