CVE-2026-8806Network attack vector

Communication outage via packet-flood processing overload

Published Jun 19, 2026 · Updated Jun 19, 2026

Expected behavior violation in Mitsubishi Electric FX5-ENET/IP all versions allows remote attackers to stop its communication function. A short burst of many packets to the module's Ethernet port raises processing load enough to prevent internal anomaly detection from running. Network reachability without authentication is sufficient, and successful exploitation interrupts communications while leaving confidentiality and integrity unaffected.

CVSS severity8.7
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Expected behavior violation in Mitsubishi Electric FX5-ENET/IP all versions allows remote attackers to stop its communication function. A short burst of many packets to the module's Ethernet port raises processing load enough to prevent internal anomaly detection from running. Network reachability without authentication is sufficient, and successful exploitation interrupts communications while leaving confidentiality and integrity unaffected.

The record

CVE
CVE-2026-8806
Published
Jun 19, 2026
Updated
Jun 19, 2026
Vendor
Mitsubishi Electric Corporation
Product
MELSEC iQ-F FX5-ENET/IP Ethernet Module
Classifications
CWE-440, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mitsubishi Electric Corporation · MELSEC iQ-F FX5-ENET/IP Ethernet Moduleversion=All versions

Published CVSS scores

8.7Mitsubishi Electric CorporationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-440Expected Behavior Violation
T1498Network Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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