Linksys WRT54GSv4 Wireless-G Router Firmware 4.21.5.000 Download

Posted at February 22, 2025 by PCI-DB Team

Linksys WRT54GSv4 Wireless-G Router Firmware 4.21.5.000 Description

General Notes:

- This firmware is compatible with WRT54GS hardware version 7.2 only. Please check the bottom of your router to make sure you have the correct version.
- Disconnect all wireless clients from the router during the upgrade process. Make sure no wireless clients attempt to associate with the router until the upgrade process is complete.

(NOTE: Firmware 7.2.06 and above are not compatible with Linksys EasyLink Advisor (LELA) version 1.6. If you would like to continue to use LELA 1.6, do not upgrade the router with these firmware builds.)

Fixes:

- Resolves issue with UPnP denial of service security vulnerability.

  It is highly recommended to always use the most recent driver version available.

Try to set a system restore point before installing a device driver. This will help if you installed an incorrect or mismatched driver. Problems can arise when your hardware device is too old or not supported any longer.

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