CVE-2022-45510 is a high-severity vulnerability identified in the Tenda W30E router firmware version 1.0.1.25(633). The vulnerability is a stack-based buffer overflow triggered via the mit_ssid_index parameter in the /goform/AdvSetWrlsafeset endpoint. This endpoint is likely part of the router's web management interface, which handles advanced wireless safety settings. A stack overflow occurs when more data is written to a buffer located on the stack than it can hold, potentially allowing an attacker to overwrite adjacent memory, leading to arbitrary code execution or denial of service. The CVSS 3.1 base score of 7.5 reflects a high severity, with the vector indicating that the vulnerability is remotely exploitable over the network (AV:N), requires no privileges (PR:N), and no user interaction (UI:N). The scope is unchanged (S:U), and the impact is solely on availability (A:H), with no confidentiality or integrity impact. This suggests that exploitation would primarily cause a denial of service, such as a router crash or reboot, rather than data theft or manipulation. No known exploits are currently reported in the wild, and no patches or vendor advisories are linked, indicating that mitigation may require manual intervention or firmware updates once available. The vulnerability is classified under CWE-787, which covers out-of-bounds writes, consistent with stack overflow behavior. Given the nature of the vulnerability, an unauthenticated remote attacker could send a specially crafted HTTP request to the vulnerable endpoint with a malicious mit_ssid_index parameter value, triggering the overflow and causing service disruption.

For European organizations, the primary impact of CVE-2022-45510 is the potential for denial of service on affected Tenda W30E routers. This could disrupt network connectivity, impacting business operations, especially for small to medium enterprises or branch offices relying on these consumer-grade or small office routers. While the vulnerability does not directly compromise confidentiality or integrity, the loss of availability can hinder access to critical services, delay communications, and reduce productivity. In sectors where continuous network uptime is critical, such as healthcare, finance, or manufacturing, even temporary outages can have significant operational and financial consequences. Additionally, denial of service could be used as part of a larger attack strategy to distract or degrade defenses during more complex intrusions. Given that no authentication or user interaction is required, attackers could automate exploitation attempts, increasing the risk of widespread disruption if many devices remain unpatched. The absence of known exploits in the wild suggests limited current impact, but the vulnerability remains a risk until mitigated.

1. Immediate Network Segmentation: Isolate Tenda W30E devices from critical network segments to limit the impact of potential denial of service. 2. Access Control: Restrict access to the router's management interface to trusted IP addresses only, preferably via VPN or internal networks, to prevent unauthorized remote exploitation. 3. Firmware Updates: Monitor Tenda's official channels for firmware updates addressing this vulnerability and apply patches promptly once available. 4. Web Interface Hardening: Disable remote management features if not required, or change default ports and credentials to reduce exposure. 5. Intrusion Detection: Deploy network-based intrusion detection systems (NIDS) with custom signatures to detect anomalous HTTP requests targeting /goform/AdvSetWrlsafeset or suspicious mit_ssid_index parameter usage. 6. Incident Response Planning: Prepare for potential denial of service incidents by having backup connectivity options and rapid device replacement procedures. 7. Vendor Engagement: Engage with Tenda or authorized resellers to confirm vulnerability status and request mitigation guidance or patches. 8. Device Inventory and Replacement: Identify all Tenda W30E devices in the environment and consider replacement with more secure hardware if firmware support is lacking.