CVE-2026-8806
HIGHDescription
Expected Behavior Violation vulnerability in Mitsubishi Electric MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP all versions allows a remote attacker to cause a denial-of-service (DoS) condition in the affected product by continuously sending a large number of communication packets to the Ethernet port of the product in a short period of time, increasing the processing load of the product, preventing the internal anomaly-detection processing from being performed, and causing the communication function to stop.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v4 Vector
Exploitability
Impact
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
Exploit Intelligence
Moderate risk: more likely to be exploited than 47% of all known CVEs.
References
Related Vulnerabilities
Other CWE-440 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2019-5108 | Medium | 6.5 | 10% | - | Fix |
| CVE-2023-6129 | Medium | 6.5 | 2.3% | - | Fix |
| CVE-2021-41035 | Critical | 9.8 | 1.7% | - | Fix |
| CVE-2018-12550 | High | 8.1 | 1.4% | - | Fix |
| CVE-2019-6569 | Critical | 9.1 | 1.3% | - | Fix |
| CVE-2023-2088 | Medium | 6.5 | 1.2% | - | Fix |
Common questions
How do I fix CVE-2026-8806?
No published fix for CVE-2026-8806 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-8806 being actively exploited?
Not that we know of. CVE-2026-8806 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.64% is the estimated probability that it will be exploited in the next 30 days. That is higher than 47% of all scored CVEs.
How severe is CVE-2026-8806?
CVE-2026-8806 has a CVSS v4 base score of 8.7, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-22.