Is CVE-2023-49621 in the CISA KEV catalog?

No. CVE-2023-49621 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-49621?

CVE-2023-49621 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2023-49621?

CVE-2023-49621 has an EPSS score of 0.60% (44th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-49621?

Upgrade simatic cn 4100 to 2.7 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2023-49621

CRITICAL

9.8

CVSS v3

NVD

Description

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.

CWE-1392

How to fix

Remediation Available

simatic cn 4100NVD

Affected:< 2.7Fixed in:2.7CVE-2023-49621derived from NVD

simatic cn 4100 firmwareNVD

Affected:< 2.7Fixed in:2.7CVE-2023-49621derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.60%probability of exploitation in 30 days

44thpercentile

Moderate risk: more likely to be exploited than 44% of all known CVEs.

References

Patch1

cert-portal.siemens.com

Embed a live status badge for CVE-2023-49621

Markdown

[![CVE-2023-49621](https://tridentstack.com/cve/badge/CVE-2023-49621.svg)](https://tridentstack.com/cve/CVE-2023-49621)

HTML

<a href="https://tridentstack.com/cve/CVE-2023-49621"><img src="https://tridentstack.com/cve/badge/CVE-2023-49621.svg" alt="CVE-2023-49621"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-16.