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Fencer Vulns
high 7.5

CVE-2024-8935 json

CWE-290: Authentication Bypass by Spoofing vulnerability exists that could cause a denial of service and loss of confidentiality and integr…

published 2024-11-13 23 mo ago modified 2026-06-17 4 mo ago also EUVD-2024-49493

cvss
7.5
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 44%
public exploits
0
none known

Summary

CWE-290: Authentication Bypass by Spoofing vulnerability exists that could cause a denial of service and loss of confidentiality and integrity of controllers when conducting a Man-In-The-Middle attack between the controller and the engineering workstation while a valid user is establishing a communication session. This vulnerability is inherent to Diffie Hellman algorithm which does not protect against Man-In-The-Middle attacks.

Vendor advisories

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

cisa ICSA-24-326-03 updated cvss 7.5

Schneider Electric Modicon M340, MC80, and Momentum Unity M1E & EcoStruxure (Update A)

  • Schneider Electric EcoStruxure™ Control Expert < 16.2HF003
    affected: vendor fix, mitigation se.com
  • Schneider Electric Modicon M340 CPU Controller Modicon M340 CPU Firmware >= SV3.60, < SV3.70
    affected: vendor fix, mitigation se.com
  • Schneider Electric EcoStruxure™ Control Expert 16.2_HF003 Schneider Electric Modicon M340 CPU Controller Modicon M340 CPU Firmware SV3.70
    fixed
  • Schneider Electric Modicon M340 CPU Controller Modicon M340 CPU Firmware < SV3.60 Schneider Electric Modicon MC80 Controller Modicon MC80 Firmware all versions Schneider Electric Modicon Momentum Unity M1E Processor Controller Modicon Momentum Unity M1E Processor Firmware < SV2.90
    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
total
Assessed
23 mo ago

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 7.7 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 4.0 7.7 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/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_bmxp341000
  • schneider-electric modicon_mc80_bmkc8020301
  • schneider-electric modicon_momentum_unity_m1e_processor

Classification

Weakness
  • CWE-290 Authentication Bypass by Spoofing

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.