CVE-2025-25668: Critical Vulnerability in Tenda AC8 Firmware

Tenda AC8V4 V16.03.34.06 was discovered to contain a stack overflow via the shareSpeed parameter in the sub_47D878 function. This vulnerability allows attackers to exploit the device over the network, posing a significant risk to organizations using this firmware version. The CVSS score of 9.8 categorizes this vulnerability as critical, indicating the potential for severe impact if successfully exploited.

Risk to organizations includes unauthorized access and manipulation of the affected systems. Given the attack complexity is low, and no user interaction is required, this vulnerability presents an urgent threat. Organizations should prioritize patching immediately to mitigate the risk of exploitation.

The vulnerability was published on February 20, 2025, and remains unaddressed in the current firmware. It is crucial for users of Tenda AC8V4 to remain vigilant and apply necessary updates as soon as they become available.

Currently, there are no known exploits or public proof of concept available for this vulnerability. However, the severity of the vulnerability suggests that it is a matter of time before attackers develop methods to exploit it.

With a CVSS score of 9.8, this vulnerability requires immediate attention from security teams to prevent potential breaches.

Vulnerability Details

The vulnerability, identified as CVE-2025-25668, is a critical stack overflow issue affecting the Tenda AC8V4 firmware version 16.03.34.06. The vulnerability is classified under CWE-120, which pertains to buffer copy without checking size of input. The CVSS version is 3.1 with a score of 9.8, indicating high severity due to the potential impact on confidentiality, integrity, and availability.

Technical Analysis

The root cause of this vulnerability is the improper handling of the shareSpeed parameter, leading to a stack overflow. The attack vector is network-based, requiring low complexity and no privileges or user interaction. If exploited, this vulnerability can result in high confidentiality, integrity, and availability impacts.

Risk & Impact Analysis

Organizations utilizing Tenda AC8V4 devices are at significant risk due to the critical nature of this vulnerability. The potential blast radius is extensive, as the vulnerability can be exploited remotely without user interaction. Given its critical CVSS score, organizations must assess their exposure and implement mitigation strategies immediately.

Exploitation Status

Affected Versions

The vulnerable version is Tenda AC8 firmware version 16.03.34.06. All versions prior to vendor patch are affected. Organizations using these versions should take immediate action.

Mitigation & Remediation

Organizations should prioritize patching immediately. If a patch is unavailable, workarounds should be implemented to restrict access to the vulnerable parameter. Configuration hardening and network controls should also be employed to minimize exposure.

Detection Guidance

Monitoring system logs for unusual access attempts and behavioral anomalies is crucial. Security teams should also establish network signatures to detect potential exploitation attempts.

AppSecure Threat Intelligence Insight

The long-term significance of CVE-2025-25668 lies in its demonstration of the vulnerabilities present in network devices. Security teams should evaluate their defenses against similar vulnerabilities and consider implementing comprehensive security assessments, such as penetration testing, to identify potential weaknesses in their systems.

This incident serves as a reminder of the importance of regular updates and security patches for devices used in organizational environments. Organizations should also establish a vulnerability management program to stay ahead of potential threats.

Lastly, organizations should consider implementing strategies to enhance their overall security posture and resilience against potential attacks, which can be informed by engaging in red teaming exercises.