CVE-2025-9250 in RE6250
Summary
by MITRE • 08/21/2025
A vulnerability was identified in Linksys RE6250, RE6300, RE6350, RE6500, RE7000 and RE9000 1.0.013.001/1.0.04.001/1.0.04.002/1.1.05.003/1.2.07.001. This impacts the function setPWDbyBBS of the file /goform/setPWDbyBBS. Such manipulation of the argument hint leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit is publicly available and might 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 • 09/03/2025
This vulnerability affects multiple Linksys router models including RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 running specific firmware versions. The issue resides in the setPWDbyBBS function within the /goform/setPWDbyBBS file which handles password reset operations through the web interface. The flaw represents a stack-based buffer overflow condition that occurs when processing the hint argument parameter, allowing attackers to manipulate memory layout and potentially execute arbitrary code on the affected devices. This vulnerability is particularly concerning as it enables remote exploitation without requiring authentication, making it accessible to any attacker with network access to the device. The attack vector is facilitated through the web-based management interface, where the vulnerable parameter is processed without proper bounds checking or input validation.
The technical implementation of this buffer overflow stems from improper handling of user-supplied input in the hint parameter of the setPWDbyBBS function. When the system processes the hint argument, it fails to validate the input length against the allocated buffer size, creating a condition where excessive input data can overwrite adjacent memory locations on the stack. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is classified as a critical security weakness in software applications. The vulnerability allows for potential code execution and system compromise, as attackers can craft malicious payloads that overwrite return addresses and function pointers in the stack, enabling them to redirect program execution flow. The presence of a publicly available exploit significantly increases the risk profile of this vulnerability, as it removes the barrier to entry for malicious actors who may not possess advanced exploitation skills.
The operational impact of this vulnerability extends beyond simple privilege escalation or denial of service conditions. Successful exploitation can result in complete system compromise, allowing attackers to gain persistent access to the network infrastructure. This represents a severe threat to enterprise and home network security, as routers serve as critical gateways for network traffic and often contain sensitive configuration data. The vulnerability affects devices that may be deployed in environments where security is paramount, including corporate networks, residential gateways, and IoT ecosystems. Network administrators face the challenge of securing thousands of potentially vulnerable devices without immediate vendor patches, as the vendor has not provided any response to the disclosure. The remote nature of the attack means that adversaries can exploit these devices from anywhere on the internet, making the attack surface extremely broad and difficult to monitor or control.
Mitigation strategies for this vulnerability should prioritize immediate network segmentation and access control measures to limit potential exploitation. Organizations should implement network monitoring to detect unusual traffic patterns or attempts to access the affected web interface, as well as disable unnecessary services and ports where possible. The most effective immediate solution is to update firmware to versions that address this specific buffer overflow condition, though the lack of vendor response creates a significant challenge for affected users. Security teams should consider implementing network access controls to prevent unauthorized access to the affected devices, and conduct thorough vulnerability assessments to identify other potential entry points within their network infrastructure. The absence of vendor support for this disclosure underscores the importance of maintaining awareness of publicly available exploits and the need for proactive security measures. Organizations should also consider implementing intrusion detection systems that can identify exploitation attempts targeting this specific vulnerability, as well as establishing procedures for rapid response to similar unpatched vulnerabilities in network infrastructure devices. This vulnerability demonstrates the critical importance of maintaining up-to-date firmware and the risks associated with relying on vendors for security updates in critical network infrastructure components.