CVE-2026-78802 in SK-WR6640X
Summary
by MITRE • 10/13/2026
An issue in SKYWORTH DIGITAL CO.,LTD SK-WR6640X Wi-Fi 6 Dual-Band Fiber Router (AX1800M) V1.0.3 allows a remote attacker to execute arbitrary code.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified in the SKYWORTH DIGITAL CO., LTD SK-WR6640X Wi-Fi 6 Dual-Band Fiber Router, specifically version V1.0.3, represents a critical security flaw that permits remote attackers to achieve arbitrary code execution on the targeted device. This type of vulnerability typically stems from insufficient input validation or improper handling of data within the router's management interface or underlying firmware components. In embedded networking devices like this AX1800M model, such flaws often reside in CGI scripts, web server handlers, or network service daemons that process user-supplied data without adequate sanitization. The presence of a remote code execution (RCE) vector indicates that the attacker does not require prior authentication or physical access to exploit the flaw, significantly lowering the barrier for entry and increasing the potential scope of impact across connected networks.
From a technical perspective, this vulnerability aligns with CWE-94, which describes Improper Control of Generation of Code ('Code Injection'), and potentially CWE-20, which covers Improper Input Validation. The operational mechanism likely involves injecting malicious payloads into specific parameters or headers that are subsequently interpreted by the router's operating system as executable commands. Given the nature of modern routers running Linux-based embedded systems, successful exploitation could allow an attacker to gain a shell with the privileges of the compromised service, often root level access due to legacy design practices in consumer networking hardware. This grants the adversary full control over the device, enabling them to modify configurations, install persistent backdoors, or pivot into the internal network infrastructure.
The impact of this vulnerability extends beyond the immediate compromise of the router itself. A successfully exploited router can serve as a gateway for lateral movement within a local area network (LAN). Attackers may leverage the compromised device to intercept unencrypted traffic, perform man-in-the-middle attacks against other connected devices, or use the router's computational resources and bandwidth for cryptomining or distributed denial-of-service campaigns. Furthermore, because routers often manage DNS settings and DHCP leases, an attacker could redirect users to malicious phishing sites or block access to critical services, thereby disrupting business operations or compromising user privacy on a large scale. This behavior is consistent with tactics observed in the MITRE ATT&CK framework under Initial Access via Exploitation of Remote Services and Execution via Command and Scripting Interpreter.
Mitigation strategies for this vulnerability primarily involve immediate firmware updates provided by SKYWORTH DIGITAL CO., LTD, which should address the underlying input validation flaws or code injection points. Administrators must ensure that all connected devices are running updated versions of the router's software to patch these specific weaknesses. In cases where an update is not immediately available, network segmentation can help limit the blast radius by isolating IoT and networking equipment from critical business systems using VLANs or firewall rules. Additionally, disabling remote management features if they are not strictly necessary reduces the attack surface exposed to external networks. Security monitoring tools should be configured to detect anomalous outbound connections or unusual command execution patterns originating from the router's IP address to facilitate rapid incident response in the event of a breach attempt.