CVE-2024-8937Network attack vector

Code execution via authentication function-pointer overwrite

Published Nov 13, 2024 · Updated Nov 13, 2024

Memory-buffer corruption in Schneider Electric Modicon controllers allows man-in-the-middle attackers to execute arbitrary code. A crafted Modbus function call overwrites a secondary function pointer stored in authentication-related memory. The attacker must first occupy a man-in-the-middle position; successful exploitation executes code on the controller without reported availability impact.

CVSS severity8.3
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-buffer corruption in Schneider Electric Modicon controllers allows man-in-the-middle attackers to execute arbitrary code. A crafted Modbus function call overwrites a secondary function pointer stored in authentication-related memory. The attacker must first occupy a man-in-the-middle position; successful exploitation executes code on the controller without reported availability impact.

The record

CVE
CVE-2024-8937
Published
Nov 13, 2024
Updated
Nov 13, 2024
Vendor
Distributed Data Systems
Product
Modicon Momentum Unity M1E Processor
Classifications
CWE-119, T0830, T0866
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 13, 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=All Versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Distributed Data Systems · Modicon Momentum Unity M1E Processorversion=All Versions
Distributed Data Systems · Modicon MC80version=All versions
Distributed Data Systems · Modicon M340 CPUversion=Versions prior to SV3.65

Published CVSS scores

8.3Schneider ElectricCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
6.5Schneider ElectricCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T0830Man in the Middle
T0866Exploitation of Remote Services

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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