CVE-2018-19944 in QTS
Summary
by MITRE • 01/01/2021
A cleartext transmission of sensitive information vulnerability has been reported to affect certain QTS devices. If exploited, this vulnerability allows a remote attacker to gain access to sensitive information. QNAP have already fixed this vulnerability in the following versions: QTS 4.4.3.1354 build 20200702 (and later)
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Analysis
by VulDB Data Team • 05/23/2026
This vulnerability represents a critical weakness in QTS device security infrastructure where sensitive information is transmitted in cleartext over network connections. The flaw exposes confidential data to interception by remote attackers who can capture and decode transmitted information without requiring advanced exploitation techniques. Such vulnerabilities typically occur when devices fail to implement proper encryption protocols for data transmission, leaving authentication credentials, configuration parameters, and other sensitive operational data vulnerable to eavesdropping attacks. The vulnerability affects QTS devices that have not been updated to the patched versions, creating an attack surface that adversaries can readily exploit to gain unauthorized access to system resources and operational information.
The technical implementation of this flaw falls under the category of insufficient encryption practices and weak network security controls. When devices transmit sensitive information without proper encryption, they violate fundamental security principles that require data protection both in transit and at rest. This vulnerability directly relates to CWE-319 which specifically addresses cleartext transmission of sensitive information, making it a well-documented weakness in network security protocols. The impact extends beyond simple credential theft to potentially compromise entire device management systems, allowing attackers to gain persistent access to network infrastructure and execute further malicious activities.
The operational consequences of this vulnerability are severe for organizations relying on QTS devices for network management and storage operations. Remote attackers can exploit this weakness to intercept administrative credentials, system configurations, and potentially sensitive business data that flows through the affected devices. This creates a significant risk of unauthorized system access, data breaches, and potential lateral movement within network environments. The vulnerability's remote exploitability means that attackers do not require physical access to the devices or proximity to the network, making it particularly dangerous for distributed or cloud-based deployments where network boundaries are less defined.
Organizations must immediately implement mitigation strategies to address this vulnerability, with the primary recommendation being the mandatory upgrade to QTS versions 4.4.3.1354 build 20200702 or later as provided by QNAP. This update resolves the cleartext transmission issue by implementing proper encryption protocols for all sensitive data communications. Security teams should also conduct comprehensive network monitoring to detect any potential exploitation attempts and implement additional controls such as network segmentation, firewall rules, and intrusion detection systems to minimize the attack surface. The remediation process should include thorough vulnerability assessments of all QTS devices within the organization to ensure complete protection against this and similar transmission-based vulnerabilities.