How severe is CVE-2023-49251?

CVE-2023-49251 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-49251 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-49251?

CVE-2023-49251 affects Siemens Simatic Cn 4100 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-49251?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2023-49251 have an EU (EUVD) identifier?

Yes. CVE-2023-49251 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-53253.

When was CVE-2023-49251 published?

CVE-2023-49251 was published on 2024-01-09 and last updated on 2026-06-17.

CVE-2023-49251

CVE-2023-49251 is a high-severity vulnerability in Siemens Simatic Cn 4100 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-639.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-53253
Weakness: CWE-639
Affected product: Siemens Simatic Cn 4100 Firmware
Published: 2024-01-09
Last modified: 2026-06-17

Description

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V2.7). The "intermediate installation" system state of the affected application allows an attacker to add their own login credentials to the device. This allows an attacker to remotely login as root and take control of the device even after the affected device is fully set up.

Frequently asked questions

What is CVE-2023-49251?: A vulnerability has been identified in SIMATIC CN 4100 (All versions < V2.7). The "intermediate installation" system state of the affected application allows an attacker to add their own login credentials to the device. This allows an attacker to remotely login as root and take control of the device even after the affected device is fully set up.
How severe is CVE-2023-49251?: CVE-2023-49251 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-49251 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-49251?: CVE-2023-49251 affects Siemens Simatic Cn 4100 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-49251?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-49251 have an EU (EUVD) identifier?: Yes. CVE-2023-49251 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-53253.
When was CVE-2023-49251 published?: CVE-2023-49251 was published on 2024-01-09 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-777015.pdf

Affected products (1)

cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Siemens Simatic Cn 4100 Firmware

CVE-2024-32741 — Critical (CVSS 10.0): A vulnerability has been identified in SIMATIC CN 4100 (All versions < V3.0). The affected device contains hard coded…
CVE-2023-29130 — Critical (CVSS 9.9): A vulnerability has been identified in SIMATIC CN 4100 (All versions < V2.5). Affected device consists of improper…
CVE-2024-32740 — Critical (CVSS 9.8): A vulnerability has been identified in SIMATIC CN 4100 (All versions < V3.0). The affected device contains undocumented…
CVE-2023-49621 — Critical (CVSS 9.8): A vulnerability has been identified in SIMATIC CN 4100 (All versions < V2.7). The "intermediate installation" system…
CVE-2026-22924 — Critical (CVSS 9.1): A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0). The affected application does not…
CVE-2025-40937 — High (CVSS 8.3): A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected application do not…

All CVEs affecting Siemens Simatic Cn 4100 Firmware →

Other CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities

CVE-2025-40805 — Critical (CVSS 10.0): Affected devices do not properly enforce user authentication on specific API endpoints. This could facilitate an…
CVE-2024-45032 — Critical (CVSS 10.0): A vulnerability has been identified in Industrial Edge Management Pro (All versions < V1.9.5), Industrial Edge…
CVE-2026-34037 — Critical (CVSS 9.9): Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to…
CVE-2026-52782 — Critical (CVSS 9.9): OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, there is an IDOR through…
CVE-2026-45552 — Critical (CVSS 9.9): Roxy-WI is a web interface for managing Haproxy, Nginx, Apache and Keepalived servers. In versions 8.2.6.4 and prior,…
CVE-2026-29200 — Critical (CVSS 9.9): A critical IDOR vulnerability has been discovered in Comet Backup affecting all versions from 20.11.0 to 26.1.1 and…

Browse all CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities →