CVE-2025-59368 in ASUS
Summary
by MITRE • 11/25/2025
An integer underflow vulnerability has been identified in Aicloud. An authenticated attacker may trigger this vulnerability by sending a crafted request, potentially impacting the availability of the device. Refer to the ' Security Update for ASUS Router Firmware' section on the ASUS Security Advisory for more information.
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Analysis
by VulDB Data Team • 11/25/2025
The integer underflow vulnerability identified in CVE-2025-59368 represents a critical flaw within Aicloud firmware that could compromise system availability through authenticated attack vectors. This vulnerability falls under the CWE-191 category of integer underflow, where an operation involving signed integer values results in a value that cannot be represented within the target data type, leading to unexpected behavior. The flaw manifests when the system processes crafted requests from authenticated users, indicating that the vulnerability requires legitimate user credentials or access tokens to exploit, which complicates the threat landscape but does not eliminate the risk.
The technical implementation of this vulnerability suggests that Aicloud firmware fails to properly validate input parameters during request processing, particularly when handling numeric values that should remain within defined bounds. When an authenticated attacker submits maliciously crafted requests containing specifically formatted integer values, the system's arithmetic operations can produce underflow conditions that may result in memory corruption, unexpected program termination, or denial of service scenarios. This type of vulnerability aligns with ATT&CK technique T1499.004 for network denial of service, as the exploitation can potentially render the affected device unavailable to legitimate users.
The operational impact of this vulnerability extends beyond simple service disruption, as it can affect the overall reliability and security posture of network infrastructure managed through Aicloud. Device availability is fundamentally compromised when underflow conditions occur, potentially affecting multiple connected devices and network services. The authenticated nature of the exploit means that attackers must first gain legitimate access to the system, which could involve credential compromise, session hijacking, or other initial access techniques that would be classified under ATT&CK tactics such as initial access or credential access.
Organizations deploying Aicloud firmware must implement immediate mitigations including firmware updates from the vendor as referenced in the ASUS Security Advisory, network segmentation to limit access to affected systems, and monitoring for unusual authentication patterns or malformed requests. The vulnerability demonstrates the importance of proper input validation and integer overflow/underflow protection in embedded systems and network devices. Security teams should also consider implementing intrusion detection systems that can identify and alert on suspicious request patterns that may indicate exploitation attempts, while maintaining comprehensive logging of authenticated sessions to detect potential unauthorized access or privilege escalation attempts. The remediation process requires careful planning due to the potential for service disruption during firmware updates, particularly in mission-critical environments where availability is paramount.