CVE-2024-8938

highpriority · track · 0EPSS 0.005 · 45 %ileEURUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.53% (45th) EPSS
CVSS 8.1 · high
Is it mine?
12 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability exists that could cause a potential arbitrary code execution after a successful Man-In-The-Middle attack followed by sending a crafted Modbus function call to tamper with memory area involved in memory size computation.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedModicon M340 CPU Firmware Versions prior to SV3.65 installed on Modicon M340 CPU Controller (part numbers BMXP34*)cisa_csaf_ot

    Version SV3.65 of Modicon M340 firmware includes a fix for these vulnerabilities and is available for download here: https://www.se.com/ww/en/product-range/1468- modicon-m340

    https://www.se.com/ww/en/product-range/1468-modicon-m340
  • FixedModicon MC80 Firmware Versions prior to SV2.1 installed on Modicon MC80 Controller (part numbers BMKC80)cisa_csaf_ot

    Version SV2.1 of Modicon MC80 firmware includes a fix for these vulnerabilities and is available for download here: https://www.se.com/ww/en/product-range/62396-modicon-mc80

    https://www.se.com/ww/en/product-range/62396-modicon-mc80
  • FixedModicon Momentum Unity M1E Processor Firmware Versions prior to SV2.80 installed on Modicon Momentum Unity M1E Processor Controller (171CBU*)cisa_csaf_ot

    Version SV2.80 of Modicon Momentum firmware includes a fix for these vulnerabilities and is available for download here: https://www.se.com/ww/en/product-range/535-modicon-momentum

    https://www.se.com/ww/en/product-range/535-modicon-momentum
  • MitigationModicon M340 CPU Firmware Versions prior to SV3.65 installed on Modicon M340 CPU Controller (part numbers BMXP34*)cisa_csaf_ot

    If customers choose not to apply the remediation provided above, they should immediately apply the following mitigations to reduce the risk of exploit:• Setup network segmentation and implement a firewall to block all unauthorized access to port 502/TCP • Configure the Access Control List following the recommendations of the user manuals: “Modicon M340 for Ethernet Communications Modules and Processors User Manual” chapter “Messaging Configuration Parameters”: https://www.se.com/ww/en/download/document/31007131K01000/ • Consider use of external firewall devices such as EAGLE40-07 from Belden to establish VPN connections. For more details refer to “Modicon Controller Systems Cybersecurity, User Guide”: https://www.se.com/ww/en/download/document/EIO0000001999/ • Ensure the M340 CPU is running with the memory protection activated by configuring the input bit to a physical input, for more details refer to the following guideline “Modicon Controller Systems Cybersecurity, User Guide” chapter “Controler Memory Protection”: https://www.se.com/ww/en/download/document/EIO0000001999/

    https://www.se.com/ww/en/download/document/31007131K01000/
  • MitigationModicon MC80 Firmware Versions prior to SV2.1 installed on Modicon MC80 Controller (part numbers BMKC80)cisa_csaf_ot

    If customers choose not to apply the remediation provided above, they should immediately apply the following mitigations to reduce the risk of exploit:• Setup network segmentation and implement a firewall to block all unauthorized access to port 502/TCP • Configure the Access Control List following the recommendations of the user manuals: “MC80 Programmable Logic Controller(PLC), User Manual” in the section “Access Control List (ACL)”: https://www.se.com/ww/en/download/document/EIO0000002071/ • Consider use of external firewall devices such as EAGLE40-07 from Belden to establish VPN connections. For more details refer to “Modicon Controller Systems Cybersecurity, User Guide”: https://www.se.com/ww/en/download/document/EIO0000001999/

    https://www.se.com/ww/en/download/document/EIO0000002071/
  • MitigationModicon Momentum Unity M1E Processor Firmware Versions prior to SV2.80 installed on Modicon Momentum Unity M1E Processor Controller (171CBU*)cisa_csaf_ot

    If customers choose not to apply the remediation provided above, they should immediately apply the following mitigations to reduce the risk of exploit:• Setup network segmentation and implement a firewall to block all unauthorized access to port 502/TCP • Configure the Access Control List following the recommendations of the user manuals: “Momentum for EcoStruxure™ Control Expert -171CBU78090, 171CBU98090, 171CBU98091 Processors, User Guide” in the section “Controlling Access”:https://www.se.com/ww/en/download/document/HRB44124/• Consider use of external firewall devices such as EAGLE40-07 from Belden to establish VPN connections. For more details refer to “Modicon Controller Systems Cybersecurity, User Guide”:https://www.se.com/ww/en/download/document/EIO0000001999/

    https://www.se.com/ww/en/download/document/HRB44124/
02

cvss

Technical severity, 0–10. One row per scoring source.

9.2
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.2–9.2

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · CISA US
v3.18.1highAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · cybersecurity@se.comexploitability 2.2 · impact 5.9
v4.09.2criticalCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:Nsecondary · ENISA EU
v4.09.2criticalCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · cybersecurity@se.com
v4.07.2highCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-119USCWE-119USCWE-119US
05

affected products (12)

Products and version ranges known to be affected.

06

advisories (1)

Vendor and ecosystem advisories describing this.

  • ICSA-24-326-04Schneider Electric Modicon M340, MC80, and Momentum Unity M1E (Update B)2024-11-12icsa · cisa_csaf_otUS

    Schneider Electric is aware of multiple vulnerabilities in its Modicon Controllers M340 / Momentum / MC80 products.Modicon PAC control and monitor industrial operations.Failure to apply the provided remediations/mitigations below may risk unauthorized access to the controller, which could result in the possibility of denial of service and loss of confidentiality, integrity of the controller.January 2026 Update: Remediation is now available for Modicon MC80.

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducisa_csaf_otNVDCVE.orgMITRE
published 2024-11-13modified 2026-06-17
09

references (4)

External citations — patches, advisories, analysis.

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