CVE-2025-57528 is a vulnerability identified in the Tenda AC6 router model, specifically the US_AC6V1.0BR_V15.03.05.16_multi_TD01 firmware version. The issue arises from improper handling of input parameters—funcname, funcpara1, and funcpara2—passed to the formSetCfm function accessible via the URI path SetCfm. An attacker can exploit this flaw by crafting malicious requests that manipulate these parameters, causing the device to enter a denial of service (DoS) state. This DoS condition likely results from the router's inability to properly process or validate the input, leading to a crash or service disruption. The vulnerability does not currently have an assigned CVSS score, and there are no known exploits in the wild at the time of publication. The lack of patch links indicates that a fix may not yet be available, emphasizing the need for caution. This vulnerability targets the router's web management interface or API endpoint, which is typically used for configuration and management tasks. Exploitation would require network access to the device's management interface, which may be exposed internally or externally depending on the router's configuration. The absence of detailed CWE identifiers limits the granularity of the technical classification, but the core issue is input validation leading to resource exhaustion or crash. Overall, this vulnerability represents a vector for attackers to disrupt network connectivity by incapacitating a critical network device.

For European organizations, the impact of CVE-2025-57528 can be significant, especially for those relying on Tenda AC6 routers in their network infrastructure. A successful DoS attack on these routers can lead to network outages, loss of internet connectivity, and disruption of business operations. This is particularly critical for small and medium enterprises (SMEs) or branch offices that may use consumer-grade or low-cost routers like the Tenda AC6. The disruption could affect internal communications, access to cloud services, and availability of critical applications. Additionally, if the affected routers are deployed in home office environments, this vulnerability could impact remote workers, reducing productivity and potentially exposing organizations to further risks if fallback security controls are inadequate. While the vulnerability does not appear to allow remote code execution or data breach directly, the denial of service can be leveraged as part of a larger attack chain, such as distracting security teams or facilitating lateral movement by attackers. The absence of known exploits suggests limited immediate risk, but the publication of the vulnerability may prompt threat actors to develop exploits, increasing future risk. European organizations must consider the operational impact of network device outages and the potential cascading effects on business continuity and incident response.

To mitigate CVE-2025-57528, European organizations should take several targeted actions beyond generic advice. First, identify and inventory all Tenda AC6 routers within the network, including those in branch offices and remote locations. Restrict access to the router management interface by implementing network segmentation and firewall rules that limit access to trusted administrative hosts only. Disable remote management features if not required, or ensure they are protected by strong authentication and encrypted channels (e.g., HTTPS with valid certificates). Monitor network traffic for unusual requests targeting the SetCfm URI path, which could indicate exploitation attempts. Since no official patch is currently available, consider temporary mitigations such as disabling the vulnerable functionality if possible or replacing affected devices with models from vendors with stronger security track records. Engage with Tenda support channels to obtain information on forthcoming patches or firmware updates. Additionally, implement network-level DoS protection mechanisms to detect and block abnormal traffic patterns. Regularly update network device firmware and maintain an asset management process to quickly respond to emerging vulnerabilities. Finally, educate IT staff about this specific vulnerability to ensure rapid detection and response to any exploitation attempts.