CVE-2025-50404 is a medium severity integer overflow vulnerability affecting Intelbras RX1500 Router firmware version 2.2.17 and earlier. The vulnerability arises in the websReadEvent function, which processes the "command" field within the HTTP header. Specifically, the function incorrectly uses a signed integer type (int) to handle the length or value of the "command" field. This improper handling can cause an integer overflow, leading to an array index crossing its boundary and overwriting adjacent memory fields within the array. Such a memory corruption flaw can potentially be leveraged by an attacker to manipulate internal router data structures, causing integrity issues. According to the CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N), the vulnerability can be exploited remotely over the network without any privileges or user interaction, but it only impacts the integrity of the device, not confidentiality or availability. No known exploits are currently reported in the wild, and no patches have been published yet. The vulnerability is classified under CWE-190 (Integer Overflow or Wraparound), a common software weakness that can lead to unpredictable behavior or security breaches if exploited. Given the nature of the flaw, an attacker could potentially send specially crafted HTTP requests to the router's management interface to trigger the overflow and corrupt internal data, possibly affecting routing behavior or configuration integrity.

For European organizations using Intelbras RX1500 routers, this vulnerability poses a moderate risk primarily to the integrity of network infrastructure. Compromise of router integrity could allow attackers to alter routing tables, inject malicious configurations, or disrupt network traffic flows subtly without causing outright denial of service. This could facilitate further attacks such as man-in-the-middle interception, traffic redirection, or persistent network compromise. Since the vulnerability requires no authentication and no user interaction, it is accessible to remote attackers scanning for vulnerable devices exposed to the internet or internal networks. The lack of confidentiality and availability impact reduces the immediate risk of data leakage or service outages, but integrity compromises in network devices can have cascading effects on organizational security posture. European organizations in sectors with critical network infrastructure or those relying on Intelbras routers for secure communications should consider this vulnerability seriously. The absence of known exploits provides a window for proactive mitigation before active attacks emerge.

1. Immediate mitigation should include restricting access to the router's management interface by implementing network segmentation and firewall rules to limit HTTP access only to trusted administrative hosts. 2. Disable remote management over HTTP if not strictly necessary, or replace it with more secure protocols such as HTTPS with strong authentication. 3. Monitor network traffic for unusual HTTP requests targeting the router's management interface that could indicate exploitation attempts. 4. Engage with Intelbras support or vendor channels to obtain firmware updates or patches addressing this vulnerability as soon as they become available. 5. If patching is delayed, consider deploying compensating controls such as intrusion detection/prevention systems (IDS/IPS) with custom signatures to detect malformed HTTP headers attempting to exploit integer overflow. 6. Conduct regular security audits of network devices to identify and remediate outdated firmware versions. 7. Educate network administrators about this vulnerability and ensure incident response plans include steps to handle potential router compromise scenarios.