CVE-2025-45490 is a command injection vulnerability identified in the Linksys E5600 router firmware version 1.1.0.26. The flaw exists within the runtime.ddnsStatus DynDNS function, specifically through the password parameter. Command injection vulnerabilities allow an attacker to execute arbitrary commands on the underlying operating system with the privileges of the affected application. In this case, the vulnerability can be exploited remotely over the network without requiring any authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N). The vulnerability is classified under CWE-77, which corresponds to improper neutralization of special elements used in a command ('Command Injection'). The CVSS v3.1 base score is 6.5, indicating a medium severity level, with impacts on confidentiality and integrity but no direct impact on availability. Exploiting this vulnerability could allow an attacker to execute commands that may lead to unauthorized information disclosure or modification of device settings. However, there are no known exploits in the wild at the time of publication, and no patches have been linked yet. The lack of vendor or product details beyond the Linksys E5600 model and firmware version limits the scope of detailed technical mitigation guidance but highlights the need for immediate attention to this specific router model and firmware version.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on Linksys E5600 routers in their network infrastructure. The ability to execute arbitrary commands remotely without authentication poses a risk of unauthorized access to sensitive network configurations or data passing through the device. This could lead to partial compromise of network integrity and confidentiality, potentially enabling attackers to intercept or manipulate traffic, pivot to other internal systems, or disrupt network management. While availability impact is rated as none, the indirect effects of compromised routers could degrade network performance or security posture. Organizations in sectors with stringent data protection requirements, such as finance, healthcare, and critical infrastructure, may face compliance and operational risks if such devices are exploited. The medium severity rating suggests that while the vulnerability is serious, it may require specific conditions or attacker capabilities to fully exploit, but the lack of authentication and user interaction requirements increases the threat surface.

1. Immediate firmware update: Organizations should monitor Linksys official channels for firmware updates addressing this vulnerability and apply patches promptly once available. 2. Network segmentation: Isolate affected routers from critical network segments to limit potential lateral movement in case of compromise. 3. Disable DynDNS if not required: Since the vulnerability is in the DynDNS function, disabling this feature can mitigate the attack vector. 4. Implement network-level protections: Use firewalls or intrusion prevention systems to restrict access to router management interfaces and block suspicious command injection patterns. 5. Monitor network traffic and logs: Set up alerts for unusual activity or command execution attempts on the affected devices. 6. Replace or upgrade devices: For environments where patching is delayed or unsupported, consider replacing vulnerable routers with models that have updated security features. 7. Vendor engagement: Engage with Linksys support to obtain official guidance and timelines for patches or mitigations.