CVE-2025-8817 in RE6250
Summary
by MITRE • 08/11/2025
A vulnerability was identified in Linksys RE6250, RE6300, RE6350, RE6500, RE7000 and RE9000 up to 20250801. Affected by this vulnerability is the function setLan of the file /goform/setLan. The manipulation of the argument lan2enabled leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 09/04/2025
This vulnerability resides within the Linksys wireless router firmware ecosystem affecting multiple models including RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 versions up to 20250801. The flaw exists in the setLan function located within the /goform/setLan file which serves as a critical configuration interface for network settings. The specific technical weakness manifests when processing the lan2enabled argument, creating a stack-based buffer overflow condition that represents a severe security risk for network infrastructure devices. This type of vulnerability falls under CWE-121 which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations on the program stack. The remote exploitation capability means that adversaries can trigger this vulnerability without physical access to the device, making it particularly dangerous for enterprise and residential network deployments.
The operational impact of this vulnerability extends beyond simple device compromise as it enables attackers to potentially execute arbitrary code on affected routers, effectively granting them complete control over network traffic routing and configuration management. The buffer overflow can be exploited to overwrite critical program execution flow, potentially allowing for privilege escalation or complete system takeover. Given that these routers serve as primary network gateways for countless households and small businesses, the implications of successful exploitation could include complete network infiltration, data interception, and redirection of traffic through malicious endpoints. The public disclosure of this exploit significantly increases the risk surface as threat actors can now leverage automated scanning tools to identify vulnerable devices across the internet. The lack of vendor response to early disclosure attempts represents a critical failure in coordinated vulnerability disclosure practices that leaves users exposed for extended periods without remediation.
Security professionals should immediately implement network segmentation strategies to isolate affected routers from critical internal systems and establish monitoring protocols for unusual network traffic patterns that might indicate exploitation attempts. The recommended mitigation includes updating firmware to versions that address this specific buffer overflow condition, though the absence of vendor response suggests that such updates may not be forthcoming. Organizations should also deploy network intrusion detection systems capable of identifying exploitation attempts targeting the specific /goform/setLan endpoint and implement strict access controls to limit who can reach the administrative interfaces of these devices. According to ATT&CK framework, this vulnerability maps to T1071.001 for application layer protocol usage and T1566 for credential harvesting, as compromised routers can serve as entry points for broader network attacks. The exploitation of this vulnerability aligns with ATT&CK technique T1496 for resource hijacking, where compromised devices can be used for botnet activities or as pivot points for lateral movement within networks. Network administrators should also consider implementing zero trust principles for router management interfaces and establish regular vulnerability scanning schedules to identify similar unpatched firmware components across their infrastructure.