CVE-2021-20591
Last modified
CVE-2021-20591 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Uncontrolled Resource Consumption vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R00/01/02CPU all versions, R04/08/16/32/120(EN)CPU all versions, R08/16/32/120SFCPU all versions, R08/16/32/120PCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to prevent legitimate clients from connecting to the MELSOFT transmission port (TCP/IP) by not closing a connection properly, which may lead to a denial of service (DoS) condition.. EPSS estimates a 1.50% chance of exploitation in the next 30 days.
Description
Uncontrolled Resource Consumption vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R00/01/02CPU all versions, R04/08/16/32/120(EN)CPU all versions, R08/16/32/120SFCPU all versions, R08/16/32/120PCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to prevent legitimate clients from connecting to the MELSOFT transmission port (TCP/IP) by not closing a connection properly, which may lead to a denial of service (DoS) condition.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mitsubishielectric | R00cpu Firmware | All versions |
| Mitsubishielectric | R01cpu Firmware | All versions |
| Mitsubishielectric | R02cpu Firmware | All versions |
| Mitsubishielectric | R04cpu Firmware | All versions |
| Mitsubishielectric | R08cpu Firmware | All versions |
| Mitsubishielectric | R16cpu Firmware | All versions |
| Mitsubishielectric | R32cpu Firmware | All versions |
| Mitsubishielectric | R120cpu Firmware | All versions |
| Mitsubishielectric | R08sfcpu Firmware | All versions |
| Mitsubishielectric | R16sfcpu Firmware | All versions |
| Mitsubishielectric | R32sfcpu Firmware | All versions |
| Mitsubishielectric | R120sfcpu Firmware | All versions |
| Mitsubishielectric | R08pcpu Firmware | All versions |
| Mitsubishielectric | R16pcpu Firmware | All versions |
| Mitsubishielectric | R32pcpu Firmware | All versions |
| Mitsubishielectric | R120pcpu Firmware | All versions |
| Mitsubishielectric | R08psfcpu Firmware | All versions |
| Mitsubishielectric | R16psfcpu Firmware | All versions |
| Mitsubishielectric | R32psfcpu Firmware | All versions |
| Mitsubishielectric | R120psfcpu Firmware | All versions |
References
- https://jvn.jp/vu/JVNVU98060539/index.htmlThird Party Advisory
- https://jvn.jp/vu/JVNVU98060539/index.htmlThird Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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