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CVE-2024-8419: Improper Access Control vulnerability in AC4xxS devices

• Severity: high (CVSS 7.5 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: 2025-06-30 · updated 2026-06-17
• Weakness: CWE-306

Description

The endpoint hosts a script that allows an unauthorized remote attacker to put the system in a fail-safe state over the network due to missing authentication.

Affected products

• ifm electronic GmbH ifm Smart PLC AC402s: from 4.04 before 4.3.17; 6.1.8 — fixed in 4.3.17
• ifm electronic GmbH ifm Smart PLC AC422s: from 4.04 before 4.3.17; 6.1.8 — fixed in 4.3.17
• ifm electronic GmbH ifm Smart PLC AC424s: from 4.04 before 4.3.17; 6.1.8 — fixed in 4.3.17
• ifm electronic GmbH ifm Smart PLC AC432s: from 4.04 before 4.3.17; 6.1.8 — fixed in 4.3.17
• ifm electronic GmbH ifm Smart PLC AC434s: from 4.04 before 4.3.17; 6.1.8 — fixed in 4.3.17

How to fix

Upgrade to a fixed version: ifm electronic GmbH ifm Smart PLC AC402s 4.3.17; ifm electronic GmbH ifm Smart PLC AC422s 4.3.17; ifm electronic GmbH ifm Smart PLC AC424s 4.3.17; ifm electronic GmbH ifm Smart PLC AC432s 4.3.17; ifm electronic GmbH ifm Smart PLC AC434s 4.3.17. Check the vendor advisory for mitigations.

References

• https://cert.vde.com/en/advisories/VDE-2024-061

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