Small changes to home router settings can significantly improve cybersecurity, says BSI

The Federal Office for Information Security offers practical tips for households to bolster their home network defenses, emphasising the importance of updating, customisation, and segmentation to reduce vulnerability to cyber threats.

Home routers remain a weak point in domestic cyber security, and the Federal Office for Information Security says small configuration changes can make a meaningful difference. Its guidance focuses on basic defences that many users overlook: replacing factory login details, keeping firmware current, switching off functions that are not needed, and separating guests and smart devices from the main network.

One of the simplest but most important steps is to change any default router name and password as soon as the device is installed. According to the BSI, a visible model name can help an attacker identify equipment and try common credentials, especially on older devices that still ship with predictable logins. The office recommends at least eight characters for router administration accounts, combining upper and lower case letters, numbers and symbols, while Wi-Fi passwords should be much longer and unrelated, ideally at least 20 characters.

Keeping firmware updated is equally important. The BSI says router security patches are only effective if they are actually installed, even when vendors provide them automatically. That advice reflects a broader pattern in current cyber threats: in April 2026, the BSI warned about exploited weaknesses in products including F5 BIG-IP, Citrix NetScaler and Trivy, while separate reporting in the same period described attackers abusing an unpatched D-Link router flaw in a Mirai-linked campaign. The message was clear: neglected updates can quickly turn ordinary equipment into an entry point for wider attacks.

The office also advises disabling features that are not in regular use. Some routers bundle media services, remote administration tools or other extras that broaden the attack surface if they contain vulnerabilities. Remote access is a particular concern, because it allows login from outside the home and therefore creates a target that does not depend on physical proximity to the network. The BSI says such functions should only remain active when they are genuinely required.

For households that host visitors or connect smart devices, the guest network is one of the more practical protections. It creates a separate access point with its own password, so a compromised phone, laptop or poorly secured IoT device is less likely to reach the main home network. Many routers also let owners limit what guests can access and when they can connect. In a period when router flaws have repeatedly been abused in the wild, the BSI’s advice is modest but relevant: reduce exposure, update early and keep the home network segmented.