CVE-2026-2530 identifies a command injection vulnerability in the Wavlink WL-WN579A3 router firmware versions up to 20210219. The vulnerability resides in the AddMac function of the /cgi-bin/wireless.cgi script, which processes the macAddr parameter insecurely. An attacker can remotely manipulate this parameter to inject and execute arbitrary system commands on the device without requiring authentication or user interaction. This vulnerability allows an attacker to gain control over the router, potentially enabling network reconnaissance, traffic interception, or pivoting to other internal systems. The vendor was notified early but has not issued any patches or advisories, and a public exploit is available, increasing the risk of exploitation. The CVSS v4.0 score of 5.3 reflects a medium severity, considering the attack vector is network-based with low complexity and no privileges or user interaction required, but with limited impact on confidentiality, integrity, and availability. The vulnerability affects a widely deployed consumer and small business router model, making it a significant concern for environments relying on this hardware for network connectivity. The lack of vendor response and patch availability necessitates immediate defensive measures by users and administrators.

For European organizations, this vulnerability poses a risk of unauthorized remote command execution on affected Wavlink WL-WN579A3 routers. Successful exploitation could lead to full compromise of the router, enabling attackers to intercept or manipulate network traffic, disrupt network availability, or use the device as a foothold for further attacks within the internal network. This is particularly concerning for small and medium enterprises or branch offices relying on these routers for critical connectivity. The absence of vendor patches increases the window of exposure. Confidentiality may be impacted through traffic interception, integrity through unauthorized configuration changes, and availability if the device is disabled or misused. The medium CVSS score reflects moderate impact, but the ease of exploitation and public exploit availability elevate the practical risk. European organizations with limited network segmentation or monitoring may be especially vulnerable to lateral movement and data exfiltration attempts stemming from this flaw.

1. Immediately isolate Wavlink WL-WN579A3 devices from untrusted networks, especially the internet, to prevent remote exploitation. 2. Disable remote management interfaces and restrict access to the router's administrative functions to trusted internal IPs only. 3. Implement network segmentation to limit the impact of a compromised router on critical internal systems. 4. Monitor network traffic for unusual command execution patterns or unexpected outbound connections originating from these devices. 5. Replace affected devices with routers from vendors that provide timely security updates if no patch is forthcoming. 6. Employ intrusion detection/prevention systems (IDS/IPS) with signatures targeting known exploits of this vulnerability. 7. Regularly audit router configurations and logs for signs of compromise. 8. Engage with Wavlink support channels to seek updates or official mitigation guidance. 9. Educate IT staff about the vulnerability and ensure incident response plans include scenarios involving compromised network infrastructure devices.