CVE-2025-52853 in QTS
Summary
by MITRE • 10/03/2025
A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack.
We have already fixed the vulnerability in the following versions: QTS 5.2.6.3195 build 20250715 and later QuTS hero h5.2.6.3195 build 20250715 and later
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Analysis
by VulDB Data Team • 10/09/2025
This vulnerability represents a critical null pointer dereference flaw within QNAP operating system implementations that fundamentally compromises system stability and availability. The issue manifests when specific administrative operations are executed within the QNAP environment, creating conditions where the system attempts to access memory locations that have not been properly initialized or allocated. Such scenarios typically occur during processing of malformed input data or in specific state transitions within the operating system's administrative interfaces, where the code path fails to validate pointer integrity before dereferencing. This particular weakness affects multiple QNAP product lines including both QTS and QuTS hero platforms, indicating a systemic flaw within the core operating system architecture rather than isolated component failures.
The operational impact of this vulnerability extends beyond simple system instability to create significant security implications for organizations relying on QNAP storage solutions. When exploited by a remote attacker who has already compromised administrative credentials, the vulnerability enables execution of targeted denial-of-service attacks that can render storage systems completely inaccessible to legitimate users. The attack vector specifically requires pre-existing administrative access, which aligns with the attacker access complexity classification in the Common Vulnerability Scoring System, suggesting that while the technical exploitation is relatively straightforward, the initial compromise must occur through other attack vectors such as credential theft, privilege escalation, or authentication bypass mechanisms. The vulnerability essentially transforms legitimate administrative capabilities into potent attack tools for service disruption, creating a scenario where authorized users become unwitting enablers of system compromise.
From a cybersecurity perspective, this vulnerability demonstrates characteristics consistent with CWE-476, which specifically addresses NULL pointer dereference conditions that can lead to system crashes and unauthorized access. The flaw operates within the broader context of software reliability issues that can be leveraged for persistent disruption attacks, potentially enabling attackers to establish denial-of-service conditions that can persist until system restart or manual intervention. The attack pattern aligns with techniques described in the MITRE ATT&CK framework under the 'Denial of Service' tactic, where adversaries leverage system weaknesses to prevent legitimate users from accessing services. The specific nature of the vulnerability suggests that the affected QNAP systems may be vulnerable to additional attack vectors that exploit similar memory management flaws, particularly in administrative interfaces and system management components.
Organizations should prioritize immediate remediation of this vulnerability by upgrading to the patched versions specified in the advisory, which include QTS 5.2.6.3195 build 20250715 and later, as well as QuTS hero h5.2.6.3195 build 20250715 and later. The mitigation strategy should also include comprehensive monitoring of administrative access logs to detect unauthorized credential usage patterns and implementation of network segmentation controls to limit the potential impact of successful exploitation attempts. Additionally, security teams should conduct thorough vulnerability assessments of other QNAP systems within their environments to identify potential similar flaws, particularly focusing on administrative interfaces and system management components that may exhibit similar memory handling behaviors. The incident highlights the critical importance of maintaining current system versions and implementing robust access control measures, as the vulnerability's exploitation requires only administrative credentials rather than complex attack techniques, making it particularly concerning for organizations with compromised administrative accounts.