CVE-2025-48826 is a format string vulnerability categorized under CWE-134 found in the Planet WGR-500 router firmware version v1.3411b190912. The vulnerability resides in the formPingCmd functionality, which processes HTTP requests. Due to improper handling of externally controlled format strings, an attacker can send a series of specially crafted HTTP requests that cause memory corruption. This can lead to arbitrary code execution or denial of service on the affected device. The vulnerability has a CVSS 3.1 base score of 8.8, indicating high severity, with an attack vector of network (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), no user interaction (UI:N), and impacts confidentiality, integrity, and availability (C:H/I:H/A:H). The flaw allows attackers with limited privileges to escalate their control over the device remotely without user interaction. No patches or public exploits are currently available, but the vulnerability is publicly disclosed and should be treated as a critical risk. The Planet WGR-500 is used in various enterprise and small-to-medium business environments, making this vulnerability relevant for network security.

The vulnerability allows remote attackers to execute arbitrary code or cause denial of service on Planet WGR-500 routers, potentially disrupting network operations. For European organizations, this could mean compromised network infrastructure, leading to data breaches, loss of network availability, and unauthorized access to sensitive information. Critical sectors such as telecommunications, government, finance, and industrial control systems relying on these devices could face operational disruptions and reputational damage. The ability to exploit this vulnerability remotely with low complexity and without user interaction increases the risk of widespread attacks. Additionally, compromised routers could be used as pivot points for further attacks within organizational networks. The absence of known exploits currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits following public disclosure.

Organizations should immediately inventory their network devices to identify any Planet WGR-500 routers running the vulnerable firmware version v1.3411b190912. Since no official patches are currently available, implement network-level mitigations such as restricting HTTP access to the management interface to trusted IP addresses only. Employ network segmentation to isolate vulnerable devices from critical systems and monitor network traffic for unusual HTTP request patterns targeting formPingCmd functionality. Disable or restrict remote management interfaces if not required. Regularly check for firmware updates from Planet and apply patches as soon as they are released. Additionally, consider deploying intrusion detection/prevention systems (IDS/IPS) with signatures targeting exploitation attempts of this vulnerability. Conduct security awareness training for network administrators to recognize and respond to potential exploitation attempts.