CVE-2021-25909 in 4CCT-EA6-334126BF
Summary
by MITRE • 01/29/2021
ZIV Automation 4CCT-EA6-334126BF firmware version 3.23.80.27.36371, allows an unauthenticated, remote attacker to cause a denial of service condition on the device. An attacker could exploit this vulnerability by sending specific packets to the port 7919.
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Analysis
by VulDB Data Team • 02/21/2021
The vulnerability identified as CVE-2021-25909 affects the ZIV Automation 4CCT-EA6-334126BF device running firmware version 3.23.80.27.36371, representing a critical remote denial of service flaw that compromises system availability. This device operates within industrial control systems and automation environments where reliability and continuous operation are paramount. The vulnerability stems from insufficient input validation and improper handling of network packets received on port 7919, which serves as the primary communication channel for the device's operational protocols.
The technical exploitation of this vulnerability occurs through the transmission of specifically crafted packets to port 7919, which triggers a condition that causes the device to become unresponsive or crash entirely. This flaw demonstrates characteristics consistent with CWE-400, indicating an improper input validation issue where the device fails to properly sanitize incoming network traffic. The unauthenticated nature of the attack means that any remote actor can exploit this weakness without requiring prior credentials or privileged access, making it particularly dangerous in operational technology environments where physical security measures may be insufficient.
The operational impact of this vulnerability extends beyond simple service interruption, potentially affecting critical industrial processes that depend on continuous operation of the affected device. In manufacturing or process control environments, such a denial of service condition could lead to production halts, safety system failures, or cascading effects throughout connected systems. The vulnerability aligns with ATT&CK technique T1499.004, which describes network denial of service attacks targeting operational technology systems, highlighting the strategic importance of maintaining availability in industrial control environments.
Mitigation strategies should focus on implementing network segmentation to restrict access to port 7919, deploying firewalls or intrusion prevention systems to filter malicious traffic patterns, and applying firmware updates provided by ZIV Automation as soon as they become available. Organizations should also consider monitoring network traffic for unusual patterns on port 7919 and implementing network access controls to limit which systems can communicate with the affected device. The vulnerability underscores the importance of maintaining current firmware versions and conducting regular security assessments of industrial control systems to identify and remediate similar weaknesses that could compromise operational continuity and safety in critical infrastructure environments.