Back to Database
Status published
Critical
CVE-2020-5544
Null Pointer Dereference vulnerability in TCP function included in the...
Vulnerability Description
Null Pointer Dereference vulnerability in TCP function included in the firmware of Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier allows remote attackers to stop the network functions or execute malware via a specially crafted packet.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
THREAT MONITOR
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2020-5544
Credits & Attribution
No credits recorded in the NVD database.
References
More from Mitsubishi Electric Corporation
View All →CVE-2025-8531
Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric...
Medium
6.8
CVE-2025-7731
Information Disclosure Vulnerability in MELSEC iQ-F Series CPU module
High
7.5
CVE-2025-7405
Information Disclosure, Information Tampering, and Denial of Service (DoS) Vulnerability in MELSEC iQ-F Series CPU module
High
7.3
CVE-2025-7376
Information Tampering Vulnerability in Multiple Processes of GENESIS64, ICONICS Suite, MobileHMI, Hyper Historian, AnalytiX, IoTWorX, MC Works64, and GENESIS
Medium
5.9
CVE-2025-5514
Denial-of-Service(DoS) Vulnerability in Web server function on MELSEC iQ-F Series CPU module
Medium
5.3
Affected Vendor
Mitsubishi Electric Corporation
View all reports →Affected Software
Mitsubishi Electric MELQIC IU1 series
Vulnerable Versions:
IU1-1M20-D firmware version 1.0.7 and earlier
Timeline
Official Publish:
March 16th, 2020
Last Modified:
August 4th, 2024
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.