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Fencer Vulns
high 7.5

CVE-2024-8403 json

Denial-of-Service Vulnerability in Ethernet port on MELSEC iQ-F Ethernet Module and EtherNet/IP Module

published 2024-11-19 23 mo ago modified 2026-06-17 4 mo ago also EUVD-2024-49627

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

Improper Validation of Specified Type of Input vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET versions 1.100 to 1.200 and FX5-ENET/IP versions 1.100 to 1.104 allows a remote attacker to cause a Denial of Service condition in Ethernet communication of the products by sending specially crafted SLMP packets.

Vendor advisories

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

cisa ICSA-24-324-01 updated cvss 7.5

Mitsubishi Electric MELSEC iQ-F Series (Update A)

  • Mitsubishi Electric MELSEC iQ-F Series FX5-ENET >=1.100, <=1.200 Mitsubishi Electric MELSEC iQ-F Series FX5-ENET/IP >=1.100, <=1.104
    affected: vendor fix, mitigation mitsubishielectric.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
23 mo ago

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP
  • mitsubishi_electric melsec_iq-f_series_fx5-enet
  • mitsubishi_electric melsec_iq-f_series_fx5-enet_ip

Classification

Weakness
  • CWE-1287 Improper Validation of Specified Type of Input

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.