CVE-2020-5527
When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions),...
When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.
- Record
CVE-2020-5527- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-400
- Updated
- 2026-11-02
CVE List No score
When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.
- Record
CVE-2020-5527- Updated
- 2026-11-02
EUVDEUVD-2020-26690 No score
When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.
- Record
EUVD-2020-26690- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5jq2-477f-97vj No score
When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions),...
When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.
- Record
GHSA-5jq2-477f-97vj- Updated
- 2026-11-02
Affected products
- mitsubishi electric corporation melsoft transmission port (udp/ip) of multiple mitsubishi electric melsec series
- mitsubishielectric cr800-q firmware
- mitsubishielectric fx3g firmware
- mitsubishielectric fx3gc firmware
- mitsubishielectric fx3s firmware
- mitsubishielectric fx3u firmware
- mitsubishielectric fx3uc firmware
- mitsubishielectric fx5u firmware
- mitsubishielectric fx5uc firmware
- mitsubishielectric fx5uj firmware
- mitsubishielectric l02cpu-p firmware
- mitsubishielectric l02cpu firmware
Show 35 moreShow less
- mitsubishielectric l02scpu-p firmware
- mitsubishielectric l02scpu firmware
- mitsubishielectric l06cpu-p firmware
- mitsubishielectric l06cpu firmware
- mitsubishielectric l26cpu-bt firmware
- mitsubishielectric l26cpu-p firmware
- mitsubishielectric l26cpu-pbt firmware
- mitsubishielectric l26cpu firmware
- mitsubishielectric q02phcpu firmware
- mitsubishielectric q06phcpu firmware
- mitsubishielectric q12dccpu-v firmware
- mitsubishielectric q12phcpu firmware
- mitsubishielectric q12prhcpu firmware
- mitsubishielectric q172dscpu firmware
- mitsubishielectric q173dscpu firmware
- mitsubishielectric q173nccpu firmware
- mitsubishielectric q24dhccpu-ls firmware
- mitsubishielectric q24dhccpu-v firmware
- mitsubishielectric q24dhccpu-vg2 firmware
- mitsubishielectric q25phcpu firmware
- mitsubishielectric q25prhcpu firmware
- mitsubishielectric q26dhccpu-ls firmware
- mitsubishielectric r00cpu firmware
- mitsubishielectric r01cpu firmware
- mitsubishielectric r02cpu firmware
- mitsubishielectric r04cpu firmware
- mitsubishielectric r04encpu firmware
- mitsubishielectric r08cpu firmware
- mitsubishielectric r08encpu firmware
- mitsubishielectric r120cpu firmware
- mitsubishielectric r120encpu firmware
- mitsubishielectric r16cpu firmware
- mitsubishielectric r16encpu firmware
- mitsubishielectric r32cpu firmware
- mitsubishielectric r32encpu firmware
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-5527 is a high vulnerability (CVSS 7.5) in Mitsubishi Electric Corporation Melsoft Transmission Port (udp/ip) Of Multiple Mitsubishi Electric Melsec Series, published March 30, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.36%, the 72nd percentile. No source names a fixed version.