CVE-2025-60662 is a stack overflow vulnerability identified in the Tenda AC18 router firmware version V15.03.05.19. The flaw exists in the function fromAdvSetMacMtuWan, specifically triggered by the wanSpeed parameter. A stack overflow occurs when more data is written to a buffer located on the stack than it can hold, potentially overwriting adjacent memory and leading to unpredictable behavior. In this case, improper validation or bounds checking of the wanSpeed parameter allows an attacker to craft a malicious input that overflows the stack. This can result in memory corruption, which may be exploited to execute arbitrary code with elevated privileges on the device. Routers like the Tenda AC18 are critical network infrastructure components, often used in both home and small office environments. Exploiting this vulnerability could allow attackers to gain control over the router, intercept or manipulate network traffic, disrupt connectivity, or use the device as a foothold for further attacks within the network. Although no known exploits are currently reported in the wild, the nature of stack overflow vulnerabilities makes them attractive targets for attackers once public disclosure occurs. The lack of a CVSS score and absence of patches or mitigations at the time of publication indicate that this vulnerability is newly disclosed and requires urgent attention from users and administrators of affected devices.

For European organizations, the impact of this vulnerability can be significant, especially for small and medium enterprises (SMEs) and home office setups relying on Tenda AC18 routers. Compromise of these routers could lead to unauthorized access to internal networks, interception of sensitive communications, and potential lateral movement to other critical systems. Given the router's role as a gateway device, exploitation could disrupt business operations by causing network outages or degraded performance. Additionally, attackers could leverage compromised routers to launch distributed denial-of-service (DDoS) attacks or as part of botnets, affecting broader internet infrastructure. The confidentiality, integrity, and availability of organizational data and services are at risk. Since the vulnerability does not require authentication or user interaction (assuming the wanSpeed parameter can be manipulated remotely), the attack surface is broad, increasing the likelihood of exploitation if the device is exposed to untrusted networks.

Immediate mitigation steps include isolating the affected Tenda AC18 routers from untrusted networks, especially the internet, until a firmware update or patch is available. Network administrators should implement strict access controls on router management interfaces, restricting them to trusted IP addresses and disabling remote management if not necessary. Monitoring network traffic for unusual patterns or attempts to exploit the wanSpeed parameter can help detect early signs of attack. Employing network segmentation to limit the impact of a compromised router is advisable. Users should regularly check the vendor’s official channels for firmware updates addressing this vulnerability and apply them promptly once released. As a longer-term measure, organizations should consider replacing vulnerable devices with models that have a stronger security track record and support timely patching. Additionally, deploying intrusion detection/prevention systems (IDS/IPS) capable of recognizing exploitation attempts targeting this vulnerability can enhance defense.