Stack-based Buffer Overflow in Linksys Routers

CVE-2025-6752

What is CVE-2025-6752?

CVE-2025-6752 is a critical vulnerability found in select models of Linksys routers, specifically the WRT1900ACS, EA7200, EA7450, and EA7500, before firmware version 20250619. This vulnerability arises from a stack-based buffer overflow within the SetDefaultConnectionService function, located in the IGD component of the router's UPnP control system. The flaw occurs due to improper handling of input arguments, which can be exploited remotely by an attacker. If successfully executed, this vulnerability could allow unauthorized access to the device, enabling an attacker to execute arbitrary code, potentially compromising the entire network connected to the affected router. Given that routers serve as critical gateways for home and enterprise networks, this vulnerability poses a significant risk to the confidentiality, integrity, and availability of data transmitted across these networks.

Potential Impact of CVE-2025-6752

1. Remote Code Execution: The buffer overflow can be exploited to execute arbitrary code on the router, allowing attackers to gain control over the device and potentially redirect or intercept traffic from devices connected to the network.

2. Network Compromise: Successful exploitation can lead to further network vulnerabilities, enabling attackers to manipulate other connected devices, conduct man-in-the-middle attacks, or deploy malware across the network.

3. Data Loss or Theft: With control over the router, attackers can access sensitive data transmitted over the network, leading to potential data breaches that could affect both individual users and organizations, resulting in financial and reputational damage.

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