CVE-2022-45641 in AC6
Summary
by MITRE • 12/02/2022
Tenda AC6V1.0 V15.03.05.19 is vulnerable to Buffer Overflow via formSetMacFilterCfg.
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Analysis
by VulDB Data Team • 04/24/2025
The vulnerability identified as CVE-2022-45641 affects the Tenda AC6V1.0 router firmware version V15.03.05.19 and represents a critical buffer overflow condition that can be exploited through the formSetMacFilterCfg web interface endpoint. This issue stems from inadequate input validation and memory management within the router's web server component, specifically when processing MAC filter configuration data submitted through the administrative interface. The buffer overflow occurs when the device receives a specially crafted payload containing excessive data in the MAC filter configuration parameters, causing the application to write beyond allocated memory boundaries.
The technical flaw manifests in the improper handling of user-supplied input within the web application's form processing logic. When administrators or attackers submit configuration data through the formSetMacFilterCfg endpoint, the system fails to properly validate the length of MAC addresses or filter rules before copying them into fixed-size buffers. This classic buffer overflow vulnerability allows an attacker to overwrite adjacent memory locations, potentially leading to arbitrary code execution or system crashes. The vulnerability is categorized under CWE-121 as a stack-based buffer overflow, which is particularly dangerous in embedded systems where memory corruption can result in complete system compromise.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable full system compromise. An attacker who can successfully exploit this buffer overflow could gain unauthorized access to the router's administrative interface, modify network configurations, redirect traffic, or even install malicious firmware. The vulnerability is particularly concerning because it affects a widely deployed router model and can be exploited remotely without authentication, making it an attractive target for automated exploitation campaigns. Network administrators should consider this vulnerability as a potential entry point for broader network infiltration attacks, especially in environments where routers serve as primary network gateways.
Mitigation strategies should focus on immediate firmware updates from Tenda, as the vendor has likely released patches addressing this specific buffer overflow condition. Organizations should implement network segmentation to limit exposure of affected devices and monitor for suspicious administrative access attempts. The vulnerability aligns with ATT&CK technique T1072 for software deployment, where attackers may attempt to establish persistent access through compromised network devices. Additional protective measures include disabling unnecessary web management interfaces, implementing strict firewall rules, and conducting regular vulnerability assessments of network infrastructure. Security teams should also consider deploying intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability pattern.