What is CVE-2023-29131?

CVE-2023-29131 is a high-severity vulnerability in Siemens Simatic Cn 4100, classified under Incorrect Default Permissions. CVSS score: 7.4/10. Published 2023-07-11.

How severe is CVE-2023-29131?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Siemens Simatic Cn 4100

CVE-2023-29131

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V2.5). Affected device consists of an incorrect default value in the SSH configuration. This could allow an attacker to bypass network isolation.

Published 2023-07-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (35.3th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Siemens Simatic Cn 4100 — versions All versions < V2.5
Siemens Simatic Cn 4100 Firmware

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

References

cert-portal.siemens.com/productcert/pdf/ssa-313488.pdf (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2023-29131?: CVE-2023-29131 is a high-severity vulnerability in Siemens Simatic Cn 4100, classified under Incorrect Default Permissions. CVSS score: 7.4/10. Published 2023-07-11.
How severe is CVE-2023-29131?: High severity. CVSS v3 base score is 7.4 out of 10.