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CVE-2023-29131

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-11 · updated 2026-10-24
• Weakness: CWE-276

Description

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.

Affected products

• Siemens SIMATIC CN 4100: before 2.5 — fixed in 2.5

How to fix

Upgrade to a fixed version: Siemens SIMATIC CN 4100 2.5. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-313488.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-313488.pdf

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