ASUS kindly released another firmware update for the RT-AC86U even though the RT-AC86U is EoL. 
ASUS RT-AC86U Firmware version 3.0.0.4.386_52294
2025/10/28
– Enhanced system stability.
– Enhanced input validation and refactored legacy string handling routines to ensure robust memory management.
– Mitigated security risks in AiCloud service by enforcing strict credential verification, implementing robust file path validation, and hardening command execution logic to prevent unauthorized access and manipulation of system resources.
– Implemented comprehensive validation and expanded command filtering in the web history API.G1
– Fixed a privilege escalation vector in the IFTTT token exchange mechanism
– Strengthened input validation and directory handling in the VPN configuration upload interface.
– Fixed an issue that allowed certain user settings to be bypassed, improving overall user control and protection.
https://www.asus.com/supportonly/rt-ac86u/helpdesk_bios?model2Name=RT-AC86U
In a completely sane world, madness is the only freedom (J.G.Ballard).
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