CVE-2024-3913: Phoenix Contact: Start sequence allows attack during the boot process

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-08-13 · updated 2026-06-17
Weakness: CWE-552

Description

An unauthenticated remote attacker can use this vulnerability to change the device configuration due to a file writeable for short time after system startup.

Affected products

Phoenixcontact Charx Sec-3000 Firmware: before 1.6.3 — fixed in 1.6.3
Phoenixcontact Charx Sec-3050 Firmware: before 1.6.3 — fixed in 1.6.3
Phoenixcontact Charx Sec-3100 Firmware: before 1.6.3 — fixed in 1.6.3
Phoenixcontact Charx Sec-3150 Firmware: before 1.6.3 — fixed in 1.6.3

How to fix

Upgrade to a fixed version: Phoenixcontact Charx Sec-3000 Firmware 1.6.3; Phoenixcontact Charx Sec-3050 Firmware 1.6.3; Phoenixcontact Charx Sec-3100 Firmware 1.6.3; Phoenixcontact Charx Sec-3150 Firmware 1.6.3. Check the vendor advisory for mitigations.

References

https://cert.vde.com/en/advisories/VDE-2024-022

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