CVE-2024-36980Public exploitNetwork attack vector

Unauthenticated runtime crash via oversized memmove

Published Sep 18, 2024 · Updated Nov 4, 2025

An out-of-bounds read in OpenPLC Runtime v3 b4702061dc14d1024856f71b4543298d77007b88 allows remote attackers to crash it via crafted PCCC requests. An unsupported command returns -1, but sendRRData stores it as uint16_t, misses the signed error comparison, and passes a 0x10006 length to memmove. Unauthenticated network access to EtherNet/IP is sufficient, and successful triggering terminates the runtime with SIGSEGV.

CVSS severity7.5
High
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in OpenPLC Runtime v3 b4702061dc14d1024856f71b4543298d77007b88 allows remote attackers to crash it via crafted PCCC requests. An unsupported command returns -1, but sendRRData stores it as uint16_t, misses the signed error comparison, and passes a 0x10006 length to memmove. Unauthenticated network access to EtherNet/IP is sufficient, and successful triggering terminates the runtime with SIGSEGV.

The record

CVE
CVE-2024-36980
Published
Sep 18, 2024
Updated
Nov 4, 2025
Vendor
OpenPLC Project
Product
OpenPLC Runtime v3
Classifications
CWE-125, 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=b4702061dc14d1024856f71b4543298d77007b88

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenPLC Project · OpenPLC Runtime v3version=b4702061dc14d1024856f71b4543298d77007b88

Published CVSS scores

7.5Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS: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.

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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-125Out-of-bounds Read
T0814Denial of Service

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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