CVE-2023-50330 is a stack-based buffer overflow vulnerability identified in the boa getInfo functionality of the Realtek rtl819x Jungle SDK version 3.4.11, which is embedded in the LevelOne WBR-6013 router firmware (version RER4_A_v3411b_2T2R_LEV_09_170623). The vulnerability arises due to improper bounds checking when processing a series of HTTP requests, allowing an attacker to overflow the stack buffer. Exploitation requires sending a carefully crafted sequence of HTTP requests to the device's management interface, which can lead to remote code execution (RCE) on the router. The CVSS v3.1 score is 7.2, indicating high severity, with attack vector network (AV:N), low attack complexity (AC:L), but requiring high privileges (PR:H) and no user interaction (UI:N). The impact includes full compromise of the device, enabling attackers to manipulate network traffic, install persistent malware, or pivot into internal networks. No public exploits or patches are currently available, increasing the urgency for defensive measures. The vulnerability is classified under CWE-121 (stack-based buffer overflow), a common and dangerous class of memory corruption bugs. The affected product is a widely used consumer and small business router, making this vulnerability relevant for many network environments.

For European organizations, the exploitation of CVE-2023-50330 could lead to severe consequences including unauthorized access to internal networks, interception or manipulation of sensitive data, disruption of network services, and potential lateral movement within corporate environments. The compromise of network routers can undermine the security perimeter, exposing connected devices and critical infrastructure. Organizations in sectors such as finance, healthcare, government, and telecommunications are particularly at risk due to the sensitive nature of their data and reliance on secure network infrastructure. Additionally, the lack of available patches means that vulnerable devices remain exposed, increasing the window of opportunity for attackers. The requirement for high privileges to exploit the vulnerability suggests that attackers may need to first gain some level of access, but once achieved, the impact is critical. This vulnerability could also be leveraged in targeted attacks or supply chain compromises affecting European entities.

1. Immediately restrict access to the management interface of LevelOne WBR-6013 routers to trusted internal networks only, using firewall rules and network segmentation. 2. Disable remote management over HTTP or any unencrypted protocols; if remote management is necessary, enforce VPN or secure channels with strong authentication. 3. Monitor network traffic for unusual or repeated HTTP requests targeting the router’s management interface, especially sequences that could trigger the buffer overflow. 4. Implement strict access controls and privilege separation to limit the ability of attackers to gain the high privileges required for exploitation. 5. Regularly audit and inventory network devices to identify the presence of vulnerable firmware versions and plan for device replacement or firmware updates once patches become available. 6. Employ network intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics capable of detecting exploitation attempts targeting this vulnerability. 7. Engage with LevelOne support or vendors for firmware updates or mitigation advisories and apply patches promptly when released. 8. Educate IT staff about this vulnerability and ensure incident response plans include scenarios involving router compromise.