CVE-2025-40939
MediumCVSS 4.6Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In the SIMATIC CN 4100 device (all versions below V4.0.1), the USB port allows unauthenticated connections. An attacker with physical access can trigger a reboot causing a denial of service condition.
Risk Assessment
A physical attacker can cause device unavailability, potentially disrupting industrial operations.
Recommendation
Update SIMATIC CN 4100 to version V4.0.1 or later and restrict physical access to the device.
Other vulnerabilities in SIMATIC CN 4100
See all- CVE-2026-22924Critical
A vulnerability in SIMATIC CN 4100 (versions prior to V5.0) allows unauthenticated attackers to exhaust resources via unrestricted connections. This can disrupt normal device operations.
- CVE-2026-22925High
A vulnerability in SIMATIC CN 4100 (versions prior to V5.0) allows resource exhaustion via a high volume of TCP SYN packets. An attacker can cause service unavailability and denial-of-service conditions.
- CVE-2025-40941Medium
SIMATIC CN 4100 devices (all versions before V4.0.1) expose server information in their responses. An attacker with network access can gain useful information, increasing the likelihood of targeted attacks.
- CVE-2025-40940Medium
In SIMATIC CN 4100 (all versions < V4.0.1), the application exhibits inconsistent SNMP behavior, such as unexpected service availability and unreliable configuration handling across protocol versions. This could allow an attacker to access sensitive data.
- CVE-2025-40938High
A vulnerability has been identified in SIMATIC CN 4100 (all versions < V4.0.1) where the device stores sensitive information in the firmware. This could allow an attacker to access and misuse this information.
- CVE-2025-40937High
A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected application does not properly validate input parameters in its REST API, resulting in improper handling of unexpected arguments. This could allow an authenticated attacker to execute arbitrary code with limited privileges.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS