CVE-2024-8419Network attack vector

PLC service interruption via unauthenticated safety-state request

Published Jun 30, 2025 · Updated Feb 16, 2026

Missing authentication in ifm Smart PLC AC4xxS firmware allows remote attackers to trigger its fail-safe state with a crafted HTTP request. An endpoint-hosted script accepts the safety-state request without authenticating the caller. Network reachability to the HTTP interface is sufficient, and exploitation interrupts PLC availability and can disrupt or damage a production line.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authentication in ifm Smart PLC AC4xxS firmware allows remote attackers to trigger its fail-safe state with a crafted HTTP request. An endpoint-hosted script accepts the safety-state request without authenticating the caller. Network reachability to the HTTP interface is sufficient, and exploitation interrupts PLC availability and can disrupt or damage a production line.

The record

CVE
CVE-2024-8419
Published
Jun 30, 2025
Updated
Feb 16, 2026
Vendor
ifm electronic GmbH
Product
ifm AC432S
Classifications
CWE-306, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.04 <4.3.17
  2. Affected versionversion=6.1.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ifm electronic GmbH · ifm AC432Sversion=4.04 <4.3.17; version=6.1.8
ifm electronic GmbH · ifm AC434Sversion=4.04 <4.3.17; version=6.1.8
ifm electronic GmbH · ifm AC402Sversion=4.04 <4.3.17; version=6.1.8
ifm electronic GmbH · ifm AC422Sversion=4.04 <4.3.17; version=6.1.8
ifm electronic GmbH · ifm AC424Sversion=4.04 <4.3.17; version=6.1.8

Published CVSS scores

7.5CERT@VDECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T0814Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo