CVE-2023-45742 identifies an integer overflow vulnerability classified under CWE-190 in the updateConfigIntoFlash function of the boa web server component embedded in the LevelOne WBR-6013 router firmware, which is based on the Realtek rtl819x Jungle SDK version 3.4.11. The vulnerability arises when the function improperly handles integer values during configuration updates, leading to an overflow or wraparound condition. An attacker can exploit this by sending a carefully crafted sequence of HTTP requests to the router's management interface, triggering the overflow and enabling arbitrary code execution on the device. This attack requires network-level access and elevated privileges (PR:H), but no user interaction is needed. The vulnerability affects the specific firmware version RER4_A_v3411b_2T2R_LEV_09_170623. Successful exploitation compromises device confidentiality, integrity, and availability, potentially allowing attackers to control the router, intercept or manipulate traffic, or disrupt network services. Although no known exploits are currently in the wild, the vulnerability's nature and CVSS score of 7.2 indicate a significant risk. The lack of publicly available patches at the time of disclosure necessitates immediate mitigation through network controls and monitoring until vendor updates are released.

For European organizations, this vulnerability poses a substantial risk to network infrastructure security, especially for those deploying LevelOne WBR-6013 routers or similar devices using the vulnerable Realtek SDK firmware. Exploitation could lead to full compromise of affected routers, enabling attackers to intercept sensitive communications, manipulate network traffic, or launch further attacks within the internal network. This threatens confidentiality of data, integrity of network operations, and availability of critical services. Organizations in sectors such as telecommunications, government, finance, and critical infrastructure are particularly vulnerable due to their reliance on secure and stable network equipment. The ability to execute arbitrary code remotely without user interaction increases the attack surface, especially if management interfaces are exposed or insufficiently protected. The absence of known exploits currently limits immediate widespread impact but also means organizations must proactively address the vulnerability to prevent future exploitation.

1. Immediately restrict access to the router's management interface by implementing network segmentation and firewall rules to limit HTTP access to trusted administrative hosts only. 2. Disable remote management features if not strictly necessary to reduce exposure. 3. Monitor network traffic for unusual or repeated HTTP requests targeting the router's configuration endpoints, which may indicate exploitation attempts. 4. Engage with LevelOne support channels to obtain firmware updates or patches addressing this vulnerability as soon as they become available. 5. If patching is delayed, consider temporary device replacement or use of compensating controls such as VPNs and strong authentication to secure management access. 6. Conduct regular vulnerability assessments and penetration tests focusing on network devices to detect potential exploitation. 7. Maintain an inventory of affected devices within the organization to prioritize remediation efforts effectively.