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Fencer Vulns
medium 6.5

CVE-2024-8936 json

CWE-20: Improper Input Validation vulnerability exists that could lead to loss of confidentiality of controller memory after a successful M…

published 2024-11-13 23 mo ago modified 2026-06-17 4 mo ago also EUVD-2024-49494

cvss
6.5
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 43%
public exploits
0
none known

Summary

CWE-20: Improper Input Validation vulnerability exists that could lead to loss of confidentiality of controller memory after a successful Man-In-The-Middle attack followed by sending a crafted Modbus function call used to tamper with memory.

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 6.5

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 M340 CPU Controller Modicon M340 CPU Firmware SV3.65
    fixed
  • 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
    not affected

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
partial
Assessed
23 mo ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
CNA 4.0 8.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/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*)

Classification

Weakness
  • CWE-20 Improper Input Validation

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.