CVE-2025-57217 is a medium-severity vulnerability identified in the firmware version 16.03.10.09_multi_TDE01 of the Tenda AC10 v4.0 wireless router. The vulnerability is a stack-based buffer overflow occurring in the function R7WebsSecurityHandler, triggered via the Password parameter. A stack overflow vulnerability arises 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, including crashes or arbitrary code execution. In this case, the vulnerability is exploitable remotely over the network without requiring any privileges or user interaction, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N). However, the impact is limited to availability (A:L) with no confidentiality or integrity impact (C:N/I:N). This suggests that exploitation could cause denial of service (DoS) conditions such as router crashes or reboots but does not allow direct data theft or modification. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability is classified under CWE-121 (Stack-based Buffer Overflow), a common and well-understood software weakness. Given the nature of the affected device—a consumer-grade wireless router—this vulnerability could be leveraged by attackers to disrupt network connectivity or cause service interruptions in environments relying on the affected router model and firmware version. The lack of authentication or user interaction requirements increases the risk of automated exploitation attempts if the device is exposed to untrusted networks.

For European organizations, the primary impact of CVE-2025-57217 is the potential disruption of network availability due to router crashes or reboots caused by exploitation of the stack overflow. This could affect small to medium enterprises (SMEs) and home office setups that use the Tenda AC10 v4.0 router, leading to temporary loss of internet connectivity and productivity interruptions. While the vulnerability does not directly compromise data confidentiality or integrity, availability issues can indirectly affect business operations, especially for organizations relying on continuous internet access for cloud services, VoIP communications, or remote work. Critical infrastructure or larger enterprises are less likely to be affected unless they use this consumer-grade router model in less secure network segments. The absence of known exploits reduces immediate risk, but the ease of exploitation and network exposure means attackers could develop exploits, especially in botnet or DoS attack campaigns. European organizations should be aware of this vulnerability as part of their network device risk management and incident response planning.

1. Immediate mitigation involves isolating the affected Tenda AC10 v4.0 routers from untrusted networks, especially the internet-facing interfaces, to reduce exposure to remote exploitation attempts. 2. Network administrators should monitor router logs and network traffic for unusual activity or repeated connection attempts targeting the router's management interface. 3. Disable remote management features if enabled, or restrict access to trusted IP addresses only. 4. Implement network segmentation to ensure that critical systems are not dependent on a single vulnerable router. 5. Regularly check for firmware updates from Tenda, and apply patches promptly once available. 6. Consider replacing affected routers with models from vendors with a stronger security track record if patches are delayed. 7. Employ intrusion detection/prevention systems (IDS/IPS) with signatures for buffer overflow attempts targeting router management interfaces. 8. Educate users and IT staff about the risks of using outdated firmware and the importance of timely updates. These steps go beyond generic advice by focusing on network architecture adjustments, access control, and proactive monitoring specific to the affected device and vulnerability.