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Fencer Vulns
high 8.1

CVE-2024-8938 json

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability exists that could cause a potential arbitrar…

published 2024-11-13 23 mo ago modified 2026-06-17 4 mo ago also EUVD-2024-49496

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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.

Patch / fix

  • schneider-electric modicon_m340 SV3.65

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-24-326-04 updated cvss 8.1

Schneider Electric Modicon M340, MC80, and Momentum Unity M1E (Update B)

  • Schneider Electric Modicon M340 CPU Controller Modicon M340 CPU Firmware < SV3.65
    affected: vendor fix, mitigation se.com
  • Schneider Electric Modicon MC80 Controller Modicon MC80 Firmware < SV2.1
    affected: vendor fix, mitigation se.com
  • Schneider Electric Modicon Momentum Unity M1E Processor Controller Modicon Momentum Unity M1E Processor < SV2.80
    affected: vendor fix, mitigation se.com
  • Schneider Electric Modicon M340 CPU Controller Modicon M340 CPU Firmware SV3.65 Schneider Electric Modicon MC80 Controller Modicon MC80 Firmware SV2.1 Schneider Electric Modicon Momentum Unity M1E Processor Controller Modicon Momentum Unity M1E Processor SV2.80
    fixed

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
23 mo ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 9.2 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 4.0 9.2 CVSS: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:X

Affected products

  • Schneider Electric Modicon M340 CPU (part numbers BMXP34*)
  • Schneider Electric Modicon MC80 (part numbers BMKC80)
  • Schneider Electric Modicon Momentum Unity M1E Processor (171CBU*)
  • schneider-electric modicon_m340
  • schneider-electric modicon_mc80
  • schneider-electric modicon_momentum_unity_m1e_processor

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.