CVE-2025-15218 in AC10U
Summary
by MITRE • 12/30/2025
A weakness has been identified in Tenda AC10U 15.03.06.48/15.03.06.49. Affected by this vulnerability is the function fromadvsetlanip of the file /goform/AdvSetLanip of the component POST Request Parameter Handler. Executing manipulation of the argument lanMask can lead to buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be exploited.
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Analysis
by VulDB Data Team • 01/03/2026
The vulnerability CVE-2025-15218 represents a critical buffer overflow weakness in Tenda AC10U routers running firmware versions 15.03.06.48 and 15.03.06.49. This flaw resides within the Advanced LAN IP Settings functionality, specifically in the POST request parameter handler component that processes requests to the /goform/AdvSetLanip endpoint. The vulnerability manifests when the lanMask parameter is manipulated during the processing of advanced network configuration requests, creating a potential pathway for malicious exploitation.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within the router's web interface handler. When the system processes the lanMask parameter through the fromadvsetlanip function, it fails to properly sanitize or bound-check the user-supplied input before copying it into fixed-length buffers. This classic buffer overflow condition allows attackers to overwrite adjacent memory locations, potentially leading to arbitrary code execution or system instability. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which is particularly dangerous due to its potential for remote code execution and system compromise.
The operational impact of this vulnerability extends beyond simple network disruption to encompass full system compromise and persistent access. Since the attack vector is remote and the exploit is publicly available, any device running the affected firmware versions is immediately at risk without proper network segmentation or access controls. An attacker could leverage this vulnerability to gain unauthorized access to the router's administrative interface, potentially leading to complete network infiltration, data exfiltration, or the installation of persistent backdoors. The attack surface is particularly concerning given that many users may not regularly update their router firmware, leaving these devices vulnerable for extended periods.
Mitigation strategies for CVE-2025-15218 should prioritize immediate firmware updates from Tenda's official support channels, as this is the most effective defense against the known exploit. Network administrators should implement strict access controls by disabling remote administration features and restricting access to the router's web interface to trusted IP addresses only. Additional protective measures include deploying network segmentation to isolate critical systems from potentially compromised devices, implementing intrusion detection systems to monitor for suspicious POST requests to the vulnerable endpoint, and conducting regular vulnerability assessments to identify other potentially affected network devices. The ATT&CK framework categorizes this vulnerability under T1210 - Exploitation of Remote Services, highlighting the need for comprehensive network security controls to prevent unauthorized access through web-based attack vectors.