CVE-2025-8824 is a high-severity stack-based buffer overflow vulnerability affecting multiple Linksys range extender models, including RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000, specifically in firmware versions up to 20250801. The vulnerability resides in the setRIP function within the /goform/setRIP endpoint, where improper handling of the RIPmode and RIPpasswd parameters allows an attacker to overflow the stack buffer. This overflow can lead to arbitrary code execution or cause the device to crash, resulting in denial of service. The vulnerability is remotely exploitable without requiring user interaction or prior authentication, making it particularly dangerous. The CVSS 4.0 score of 8.7 reflects the ease of exploitation (network attack vector, low complexity), lack of required privileges or user interaction, and the high impact on confidentiality, integrity, and availability. Although the vendor was notified early, no response or patch has been issued, and public exploit code has been disclosed, increasing the risk of active exploitation in the wild.

For European organizations, this vulnerability poses significant risks, especially for enterprises and service providers relying on Linksys range extenders to enhance wireless network coverage. Successful exploitation could allow attackers to gain control over the affected devices, enabling lateral movement within internal networks, interception or manipulation of network traffic, and disruption of network availability. This could lead to data breaches, espionage, or operational downtime. Given the widespread use of Linksys products in both corporate and home office environments across Europe, the vulnerability could be leveraged in targeted attacks against critical infrastructure, SMEs, or governmental agencies. The lack of vendor response and patches exacerbates the threat, potentially increasing the window of exposure and the likelihood of exploitation.

Organizations should immediately inventory their network to identify the presence of affected Linksys range extender models and firmware versions. Until patches are available, it is critical to restrict remote access to these devices by implementing network segmentation and firewall rules that limit access to the management interfaces, especially the /goform/setRIP endpoint. Disabling remote management features or changing default credentials can reduce exposure. Monitoring network traffic for unusual requests to the vulnerable endpoint may help detect exploitation attempts. Where possible, replacing affected devices with models from vendors with active security support is advisable. Additionally, organizations should engage with Linksys support channels to seek updates or official guidance and stay informed about any forthcoming patches or advisories.