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I. Basic Information for CVE-2021-20591
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mitsubishi Electric MELSEC iQ-R series 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mitsubishi Electric MELSEC iQ-R series是日本三菱电机（Mitsubishi Electric）公司的一款可编程逻辑控制器。 Mitsubishi Electric MELSEC iQ-R Series 的 CPU 单元的 MELSOFT 通信端口 (TCP/IP) 中存在资源管理错误漏洞，该漏洞源于远程第三方保持连接到 MELSOFT 通信端口 (TCP/IP)，MELSOFT 通信端口 (TCP/IP) 的资源将被耗尽。攻击者可通过该漏洞引发DOS攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
-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 -
II. Public POCs for CVE-2021-20591
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III. Intelligence Information for CVE-2021-20591
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IV. Related Vulnerabilities
Same product: MELSEC iQ-R series CPU modules
Same vendor: n/a
V. Comments for CVE-2021-20591

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