CVE-2021-20612 : Vulnerability Insights and Analysis
Learn about CVE-2021-20612, a security vulnerability in MELSEC-F series FX3U-ENET Firmware allowing remote attackers to cause denial-of-service. Find mitigation steps and updates.
This CVE pertains to a security vulnerability in the MELSEC-F series FX3U-ENET Firmware version 1.14 and prior, FX3U-ENET-L Firmware version 1.14 and prior, and FX3U-ENET-P502 Firmware version 1.14 and prior. The lack of administrator control allows a remote unauthenticated attacker to trigger a denial-of-service condition or other unspecified effects by sending specially crafted packets. It requires a system reset for recovery.
Understanding CVE-2021-20612
This section dives into the specifics of the CVE.
What is CVE-2021-20612?
CVE-2021-20612 addresses the lack of administrator control over security vulnerability in MELSEC-F series FX3U-ENET Firmware version 1.14 and earlier, allowing remote unauthenticated attackers to cause a denial-of-service condition by manipulating TCP port communications.
The Impact of CVE-2021-20612
The impact includes a potential denial-of-service situation in the product's communication function due to unauthorized packet manipulation. However, control by the MELSEC-F series PLC remains unaffected.
Technical Details of CVE-2021-20612
This section covers the technical aspects of the CVE.
Vulnerability Description
The vulnerability arises from the lack of administrator control over security in the affected firmware versions, enabling attackers to disrupt communication functions.
Affected Systems and Versions
MELSEC-F series FX3U-ENET, FX3U-ENET-L, and FX3U-ENET-P502 with firmware version 1.14 and prior are impacted by this vulnerability.
Exploitation Mechanism
Remote unauthenticated attackers exploit this vulnerability by sending manipulated packets to trigger a denial-of-service condition in the communication function.
Mitigation and Prevention
Explore the steps to mitigate the risks associated with CVE-2021-20612.
Immediate Steps to Take
To address this vulnerability promptly, conduct a system reset and consider implementing additional security measures.
Long-Term Security Practices
Establish a robust security framework, including regular security updates and training for personnel to prevent similar incidents.
Patching and Updates
Apply the necessary firmware updates provided by the vendor to patch the vulnerability and enhance the security posture of the affected systems.