CVE-2020-5665Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an…
- 7.4HighCVSS base score
- 1.0%Exploitation in 30 daysEPSS · top 36% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet.
Timeline
ID reserved
By jpcert
- 11 months later
· 11 months later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 1.0% · top 36% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.
Affected products
Mitsubishi Electric Corporation · MELSEC iQ-F series FX5U(C) CPU unit
- affected firmware version 1.060 and earlier
References
References4
- https://us-cert.cisa.gov/ics/advisories/icsa-20-345-01 (opens in a new tab)x_refsource_MISCx_transferred
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-018_en.pdf (opens in a new tab)x_refsource_MISCx_transferred
- https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-018.pdf (opens in a new tab)x_refsource_MISCx_transferred
- https://jvn.jp/vu/JVNVU95638588/index.html (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2020-26826 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2020-5665)Record last updated .