CVE-2025-66676 in Unlocker
Summary
by MITRE • 02/13/2026
An issue in IObit Unlocker v1.3.0.11 allows attackers to cause a Denial of Service (DoS) via a crafted request.
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Analysis
by VulDB Data Team • 03/26/2026
The vulnerability identified as CVE-2025-66676 resides within IObit Unlocker version 1.3.0.11, representing a critical denial of service flaw that can be exploited by malicious actors to disrupt system operations. This software utility is designed to unlock and delete files that are typically locked by the operating system, making it a potentially attractive target for attackers seeking to compromise system stability. The flaw manifests when the application processes crafted requests that are specifically designed to trigger unexpected behavior in the software's handling mechanisms. Such requests can be constructed to exploit memory management issues or improper input validation within the unlocker's processing pipeline.
The technical implementation of this vulnerability stems from inadequate input sanitization and error handling within the application's request processing subsystem. When IObit Unlocker receives malformed or specially constructed requests, the software fails to properly validate the incoming data or handle exceptional conditions gracefully. This leads to the application crashing or becoming unresponsive, effectively rendering the system unable to perform its intended file unlocking functions. The flaw can be triggered through various attack vectors including malformed file paths, unexpected parameter values, or crafted data structures that exploit buffer handling inconsistencies. The vulnerability directly maps to CWE-400, which categorizes denial of service conditions arising from uncontrolled resource consumption or improper error handling in software applications.
The operational impact of this vulnerability extends beyond simple service disruption, potentially enabling attackers to gain persistent access to system resources or create conditions that facilitate further exploitation. In enterprise environments where IObit Unlocker is deployed across multiple systems, a successful DoS attack could result in widespread disruption of file management operations, potentially affecting business continuity and productivity. The vulnerability's exploitation requires minimal technical expertise, making it particularly dangerous as it can be leveraged by threat actors with varying skill levels. Additionally, the DoS condition may leave systems in a state where legitimate users cannot access critical files or perform necessary administrative tasks, creating cascading operational issues.
Mitigation strategies for CVE-2025-66676 should prioritize immediate software updates from IObit to address the underlying input validation flaws. Organizations must implement network segmentation and access controls to limit exposure of systems running IObit Unlocker to untrusted networks or users. Security monitoring should be enhanced to detect unusual request patterns or application crashes that may indicate exploitation attempts. The implementation of application whitelisting policies can prevent unauthorized execution of vulnerable versions while regular security assessments should verify the proper functioning of file unlocking utilities. Additionally, system administrators should consider disabling unnecessary file unlocking features when they are not actively required, reducing the attack surface for potential exploitation. This vulnerability aligns with ATT&CK technique T1499 which covers network denial of service attacks, and the remediation approach should incorporate both defensive measures and incident response protocols to ensure comprehensive protection against similar threats.