CVE-2024-39589Network attack vector

Server crash via truncated memmove source pointer

Published Sep 18, 2024 · Updated Nov 4, 2025

Denial of service in OpenPLC Runtime v3 allows remote attackers to crash the server through crafted EtherNet/IP requests. In commit 16bf8bac1a36d95b73e7b8722d0edb8b9c5bb56a, Protected_Logical_Read_Reply casts request-derived memmove source pointers to 32-bit unsigned integers, truncating 64-bit addresses before dereference. No authentication or user interaction is required; repeated PCCC Protected Logical Read requests can raise SIGSEGV and interrupt the runtime.

CVSS severity7.5
High
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in OpenPLC Runtime v3 allows remote attackers to crash the server through crafted EtherNet/IP requests. In commit 16bf8bac1a36d95b73e7b8722d0edb8b9c5bb56a, Protected_Logical_Read_Reply casts request-derived memmove source pointers to 32-bit unsigned integers, truncating 64-bit addresses before dereference. No authentication or user interaction is required; repeated PCCC Protected Logical Read requests can raise SIGSEGV and interrupt the runtime.

The record

CVE
CVE-2024-39589
Published
Sep 18, 2024
Updated
Nov 4, 2025
Vendor
OpenPLC Project
Product
OpenPLC Runtime v3
Classifications
CWE-704, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=16bf8bac1a36d95b73e7b8722d0edb8b9c5bb56a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenPLC Project · OpenPLC Runtime v3version=16bf8bac1a36d95b73e7b8722d0edb8b9c5bb56a

Published CVSS scores

7.5Cisco TalosCVSS: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-704Incorrect Type Conversion or Cast
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

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Your stack

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