What’s Vulnerable › Vulnerabilities
CVE-2025-40939
- Severity: medium (CVSS 4.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-12-09 · updated 2026-10-23
- Weakness: CWE-284
Description
A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected device contains a USB port which allows unauthenticated connections. This could allow an attacker with physical access to the device to trigger reboot that could cause denial of service condition.
Affected products
- Siemens SIMATIC CN 4100: before 4.0.1 — fixed in 4.0.1
How to fix
Upgrade to a fixed version: Siemens SIMATIC CN 4100 4.0.1. Check the vendor advisory for mitigations.
References
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