CVE-2026-24429 is a critical security vulnerability identified in the firmware of Shenzhen Tenda Technology Co., Ltd.'s W30E V2 router, specifically in versions up to and including 16.01.0.19(5037). The root cause is the presence of a built-in authentication account secured by a default password that is not required to be changed during the device's initial configuration process. This design flaw violates secure credential management best practices, as default passwords are widely known or easily guessable, enabling attackers to bypass authentication controls. The vulnerability is classified under CWE-1393, which pertains to the use of default passwords. The CVSS 4.0 base score of 9.3 reflects the critical severity, with an attack vector that is network-based (AV:N), requiring no privileges (PR:N), no user interaction (UI:N), and no authentication (AT:N). The impact metrics indicate high confidentiality, integrity, and availability impacts (VC:H, VI:H, VA:H), meaning successful exploitation can lead to full compromise of the device and potentially the network it manages. The vulnerability does not require any user interaction or prior authentication, making it trivially exploitable remotely. Although no known exploits have been reported in the wild yet, the risk remains high due to the ease of exploitation and the critical nature of the device's role in network management. No official patches or firmware updates have been published at the time of disclosure, leaving affected devices vulnerable. The vulnerability affects all devices running the specified firmware versions, which may be widely deployed in residential, small business, and possibly enterprise environments. Attackers gaining access to the management interface could alter device configurations, intercept or redirect network traffic, deploy malware, or disrupt network availability.

The potential impact of CVE-2026-24429 is severe for organizations worldwide using the Shenzhen Tenda W30E V2 routers. Unauthorized access to the management interface can lead to complete device takeover, allowing attackers to manipulate network configurations, disable security controls, and intercept sensitive data traversing the network. This compromises confidentiality, integrity, and availability of network communications and connected systems. In enterprise or critical infrastructure environments, this could facilitate lateral movement, data exfiltration, or denial of service attacks. The ease of exploitation without authentication or user interaction increases the likelihood of widespread attacks once exploit code becomes available. Organizations relying on these devices for network perimeter security or internal segmentation face heightened risk of persistent compromise. The absence of patches exacerbates the threat, potentially forcing organizations to replace hardware or implement complex network segmentation to mitigate exposure. The vulnerability also undermines trust in the vendor's security practices, potentially impacting supply chain security considerations.

1. Immediately isolate affected Shenzhen Tenda W30E V2 devices from untrusted or public networks to prevent remote exploitation. 2. Restrict management interface access strictly to trusted internal networks and use network segmentation to limit exposure. 3. Monitor network traffic and device logs for unauthorized access attempts or unusual configuration changes. 4. Disable remote management features if not absolutely necessary. 5. If possible, change the default credentials of the built-in account, although the vulnerability description suggests this may not be enforced or feasible; verify if any undocumented methods exist. 6. Engage with the vendor for firmware updates or patches and apply them promptly once available. 7. Consider replacing affected devices with models from vendors with stronger security postures if patching is not forthcoming. 8. Implement compensating controls such as VPNs or access control lists to restrict management interface access. 9. Conduct regular security audits of network devices to detect similar credential management issues. 10. Educate network administrators about the risks of default credentials and enforce strict password policies for all network equipment.