Release ASUS RT-AX55 Firmware version 3.0.0.4.386_53244 (2025/06/20)

[SDISB]

Version 3.0.0.4.386_53244
2025/06/20
ASUS website: https://www.asus.com/us/networking-...ries/rt-ax55/helpdesk_bios?model2Name=RT-AX55
SHA-256 ：F6E15444C9F16D4D08568199EDFD623CAF1CE5C006D74AAF69AF5698C0EE49FB
Download link: https://dlcdnets.asus.com/pub/ASUS/wireless/RT-AX55/FW_RT_AX55_300438653244.zip?model=RT-AX55


We recommend updating to this firmware version and performing a factory reset to ensure all the latest security enhancements are properly applied.

-Improved login password policy with a new minimum requirement of 10 characters, strengthening overall access security.
-Reinforced communication protocols between the mobile app and the router firmware to ensure more secure interactions.
-Optimized system stability for more consistent and reliable performance.
-Enhanced validation during parameter transmission to improve configuration integrity.
-Optimized routing stability under specific network conditions.
-Implemented security improvements for Dropbear.

Please note I am not associated with ASUS aside being their user and I just found out that there is a firmware update which seem to be about addressing the recent backdoor campaign:

9,000 Asus routers compromised by botnet attack and persistent SSH backdoor that even firmware updates can't fix

The backdoor evades detection and survives firmware updates

www.tomshardware.com

GreyNoise Discovers Stealthy Backdoor Campaign Affecting Thousands of ASUS Routers

GreyNoise uncovers a stealth campaign exploiting ASUS routers, enabling persistent backdoor access via CVE-2023-39780 and unpatched techniques. Learn how attackers evade detection, how GreyNoise discovered it with AI-powered tooling, and what defenders need to know.

www.greynoise.io

 

[bennor]

Please note I am not associated with ASUS aside being their user and I just found out that there is a firmware update which seem to be about addressing the recent backdoor campaign:

9,000 Asus routers compromised by botnet attack and persistent SSH backdoor that even firmware updates can't fix

The backdoor evades detection and survives firmware updates

www.tomshardware.com

GreyNoise Discovers Stealthy Backdoor Campaign Affecting Thousands of ASUS Routers

GreyNoise uncovers a stealth campaign exploiting ASUS routers, enabling persistent backdoor access via CVE-2023-39780 and unpatched techniques. Learn how attackers evade detection, how GreyNoise discovered it with AI-powered tooling, and what defenders need to know.

www.greynoise.io

An FYI. There is a separate discussion started back in May about that security vulnerability.

“GreyNoise Discovers Stealthy Backdoor Campaign Affecting Thousands of ASUS Routers”

Yet another one, or did we already know about this one? https://www.greynoise.io/blog/stealthy-backdoor-campaign-affecting-asus-routers

www.snbforums.com

PS: And an earlier discussion posted about this firmware but it didn't contain links to router support page or firmware download.

ASUS RT-AX55 Firmware version 3.0.0.4.386_53244

Version 3.0.0.4.386_53244 65.79 MB 2025/06/20 SHA-256 ：F6E15444C9F16D4D08568199EDFD623CAF1CE5C006D74AAF69AF5698C0EE49FB We recommend updating to this firmware version and performing a factory reset to ensure all the latest security enhancements are properly applied. -Improved login password...

www.snbforums.com

 

[SDISB]

An FYI. There is a separate discussion started back in May about that security vulnerability.

“GreyNoise Discovers Stealthy Backdoor Campaign Affecting Thousands of ASUS Routers”

Yet another one, or did we already know about this one? https://www.greynoise.io/blog/stealthy-backdoor-campaign-affecting-asus-routers

www.snbforums.com

PS: And an earlier discussion posted about this firmware but it didn't contain links to router support page or firmware download.

ASUS RT-AX55 Firmware version 3.0.0.4.386_53244

Version 3.0.0.4.386_53244 65.79 MB 2025/06/20 SHA-256 ：F6E15444C9F16D4D08568199EDFD623CAF1CE5C006D74AAF69AF5698C0EE49FB We recommend updating to this firmware version and performing a factory reset to ensure all the latest security enhancements are properly applied. -Improved login password...

www.snbforums.com

Thanks, I will probably keep this post up if someone want to download. I also noticed that my AX56Uv2 acting as a mesh node updated to it automatically but my AX55 didn't lol

 

[DeliciousDemur]

Thanks, I will probably keep this post up if someone want to download. I also noticed that my AX56Uv2 acting as a mesh node updated to it automatically but my AX55 didn't lol

Have you then updated it manually on your AX55? Is it straight forward? Checking the hash of the file and uploading it to the router.

 

[SDISB]

Have you then updated it manually on your AX55? Is it straight forward? Checking the hash of the file and uploading it to the router.

Don't know why but via https I couldn't upload the file and it just reboot. I use firefox but I believe this is a problem since 2024 firmware and I did try chrome to update in a previous version. Just put your router in http.
Edit: Grammar error lol I commented this at about 1AM.