CVE-2026-24103 in AC15
Summary
by MITRE • 03/03/2026
A buffer overflow vulnerability was discovered in goform/formSetMacFilterCfg in Tenda AC15V1.0 V15.03.05.18_multi.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 03/06/2026
The buffer overflow vulnerability identified as CVE-2026-24103 resides within the goform/formSetMacFilterCfg component of the Tenda AC15V1.0 V15.03.05.18_multi firmware implementation. This vulnerability represents a critical security flaw that arises from improper input validation and memory management within the router's web interface configuration handler. The affected device model Tenda AC15V1.0 operates with firmware version 15.03.05.18_multi, which contains a flaw in how it processes MAC address filtering configuration parameters. The vulnerability manifests when the system fails to properly bounds-check user-supplied input data before copying it into fixed-size memory buffers, creating an exploitable condition that can be leveraged by malicious actors to execute arbitrary code or cause system instability.
This technical flaw aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability specifically impacts the web-based administrative interface of the router, where users can configure MAC address filtering rules. When an attacker submits maliciously crafted input through the formSetMacFilterCfg endpoint, the system processes this data without adequate validation, leading to memory corruption that can be exploited to gain unauthorized access to the device's underlying operating system. The flaw represents a classic stack-based buffer overflow scenario where the input data exceeds the allocated buffer space, potentially overwriting return addresses, function pointers, or other critical memory structures.
The operational impact of this vulnerability extends beyond simple system crashes or denial of service conditions. Attackers who successfully exploit this buffer overflow can achieve arbitrary code execution with the privileges of the web server process, which typically runs with elevated system permissions. This access level provides attackers with the capability to modify network configurations, install malicious software, steal sensitive data, or establish persistent backdoors within the network infrastructure. The vulnerability affects the entire network security posture of devices running the affected firmware version, as compromised routers can serve as entry points for broader network infiltration attacks. Additionally, the affected device's web interface provides a convenient attack surface since it is designed to be accessible from remote locations, making the exploitation potential more significant than local vulnerabilities.
Mitigation strategies for this vulnerability should encompass both immediate and long-term security measures. The primary recommendation involves updating the firmware to the latest version provided by Tenda, which should include patches addressing the buffer overflow condition through proper input validation and memory bounds checking. Network administrators should also implement network segmentation and access control measures to limit exposure of vulnerable devices to untrusted networks. The implementation of web application firewalls and intrusion detection systems can help detect and prevent exploitation attempts targeting this specific vulnerability. Organizations should conduct comprehensive vulnerability assessments to identify all devices running the affected firmware version and prioritize their remediation. The ATT&CK framework categorizes this type of vulnerability under T1210 - Exploitation of Remote Services, where attackers leverage web interface vulnerabilities to achieve system compromise. Regular security monitoring and patch management protocols should be established to prevent similar vulnerabilities from arising in future firmware releases, particularly focusing on input validation and memory safety practices in embedded systems development.