Vulnerability in Erlang Otp

CVE-2025-46712

Erlang/OTP is a set of libraries for the Erlang programming language. In versions prior to OTP-27.3.4 (for OTP-27), OTP-26.2.5.12 (for OTP-26), and OTP-25.3.2.21 (for OTP-25), Erlang/OTP SSH fails to enforce strict KEX handshake hardening measures by allowing optional messages to be exchanged. This allows a Man-in-the-Middle attacker to inject these messages in a connection during the handshake. This issue has been patched in versions OTP-27.3.4 (for OTP-27), OTP-26.2.5.12 (for OTP-26), and OTP-25.3.2.21 (for OTP-25).

Published · last modified .

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (41.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-46712: held from 0.005 to 0.005.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: -0.000

Affected products

  • Erlang Otp — versions >= OTP 27.0, < OTP 27.3.4, >= OTP 26.2.1, < OTP 26.2.5.12, < OTP 25.3.2.21

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-46712?
CVE-2025-46712 is a low-severity vulnerability in Erlang Otp, classified under Expected Behavior Violation. CVSS score: 3.7/10. Published 2025-05-08.
How severe is CVE-2025-46712?
Low severity. CVSS v3 base score is 3.7 out of 10.