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CVE-2024-8419

Improper Access Control vulnerability in AC4xxS devices

HIGH
7.5
CVSS Score
Published: June 30, 2025 at 09:39 AM UTC
Updated: June 17, 2026 at 08:22 AM UTC
5 products affected across 1 vendorSmart PLC AC424sSmart PLC AC434sSmart PLC AC422s

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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Smart PLC AC402s· Ifm Electronic
60%
4.04 ≤ v < 4.3.174.046.1.8
Affected range stops below 4.3.17, so it looks safe — our inference, not a vendor statement
Smart PLC AC422s· Ifm Electronic
60%
4.04 ≤ v < 4.3.174.046.1.8
Affected range stops below 4.3.17, so it looks safe — our inference, not a vendor statement
Smart PLC AC424s· Ifm Electronic
60%
4.04 ≤ v < 4.3.174.046.1.8
Affected range stops below 4.3.17, so it looks safe — our inference, not a vendor statement
Smart PLC AC432s· Ifm Electronic
60%
4.04 ≤ v < 4.3.174.046.1.8
Affected range stops below 4.3.17, so it looks safe — our inference, not a vendor statement
Smart PLC AC434s· Ifm Electronic
60%
4.04 ≤ v < 4.3.174.046.1.8
Affected range stops below 4.3.17, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: [email protected]
https://cert.vde.com/en/advisories/VDE-2024-061

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCERTVDE
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-306

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