Mitsubishi Electric MELSEC iQ-R resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Mitsubishi Electric MELSEC iQ-R (affected version not known). It has been rated as problematic. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-400. Impacted is availability. CVE summarizes:

Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series modules (R00/01/02CPU firmware version '19' and earlier, R04/08/16/32/120 (EN) CPU firmware version '51' and earlier, R08/16/32/120SFCPU firmware version '22' and earlier, R08/16/32/120PCPU all versions, R08/16/32/120PSFCPU all versions, RJ71EN71 firmware version '47' and earlier, RJ71GF11-T2 firmware version '47' and earlier, RJ72GF15-T2 firmware version '07' and earlier, RJ71GP21-SX firmware version '47' and earlier, RJ71GP21S-SX firmware version '47' and earlier, RJ71C24 (-R2/R4) all versions, and RJ71GN11-T2 all versions) allows a remote unauthenticated attacker to cause an error in a CPU unit and cause a denial-of-service (DoS) condition in execution of the program and its communication, or to cause a denial-of-service (DoS) condition in communication via the module by a specially crafted SLMP packet

The weakness was disclosed 11/20/2020. The advisory is shared for download at This vulnerability is handled as CVE-2020-5668 since 01/06/2020. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.




CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍


Class: Denial of service
CWE: CWE-400
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔍


Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍


01/06/2020 🔍
11/20/2020 +319 days 🔍
11/20/2020 +0 days 🔍
12/09/2020 +19 days 🔍


Status: Confirmed
Confirmation: 🔍

CVE: CVE-2020-5668 (🔍)


Created: 11/20/2020 08:25 AM
Updated: 12/09/2020 04:46 PM
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍


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