CVE-2024-34026Public exploitNetwork attack vector

Remote code execution via unbounded ENIP request logging

Published Sep 18, 2024 · Updated Sep 18, 2024

Stack-based buffer overflow in OpenPLC Runtime v3 allows remote attackers to execute code via crafted EtherNet/IP requests. processEnipMessage formats every byte of an unsupported command with unbounded sprintf calls into a 1,000-byte stack buffer. An unauthenticated sender can supply a valid encapsulation header and at least 500 bytes, causing a runtime crash and enabling control-flow corruption.

CVSS severity9.0
Critical
EPSS probability2.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in OpenPLC Runtime v3 allows remote attackers to execute code via crafted EtherNet/IP requests. processEnipMessage formats every byte of an unsupported command with unbounded sprintf calls into a 1,000-byte stack buffer. An unauthenticated sender can supply a valid encapsulation header and at least 500 bytes, causing a runtime crash and enabling control-flow corruption.

The record

CVE
CVE-2024-34026
Published
Sep 18, 2024
Updated
Sep 18, 2024
Vendor
OpenPLC Project
Product
OpenPLC Runtime v3
Classifications
CWE-787, CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2024Record 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=b4702061dc14d1024856f71b4543298d77007b88

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenPLC Project · OpenPLC Runtime v3version=b4702061dc14d1024856f71b4543298d77007b88

Published CVSS scores

9.0Cisco TalosCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

Public exploit references

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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