What is CVE-2023-49621?

CVE-2023-49621 is a critical-severity vulnerability in Siemens Simatic Cn 4100, classified under CWE-1392. CVSS score: 9.8/10. Published 2024-01-09.

How severe is CVE-2023-49621?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Siemens Simatic Cn 4100

CVE-2023-49621

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V2.7). The "intermediate installation" system state of the affected application uses default credential with admin privileges. An attacker could use the credentials to gain complete control of the affected device.

Published 2024-01-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.6th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Siemens Simatic Cn 4100 — versions All versions < V2.7
Siemens Simatic Cn 4100
Siemens Simatic Cn 4100 Firmware

Weakness classification (CWE)

CWE-1392

References

cert-portal.siemens.com/productcert/pdf/ssa-777015.pdf (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2023-49621?: CVE-2023-49621 is a critical-severity vulnerability in Siemens Simatic Cn 4100, classified under CWE-1392. CVSS score: 9.8/10. Published 2024-01-09.
How severe is CVE-2023-49621?: Critical severity. CVSS v3 base score is 9.8 out of 10.