CVE-2023-39780 ASUS CVE debrief

Who should care

Organizations and individuals operating ASUS RT-AX55 routers, especially administrators of internet-facing or remotely managed networks, should prioritize this issue. Managed service providers and security teams responsible for edge devices should also verify whether the model is deployed anywhere in their environment.

Technical summary

The supplied sources identify the issue as an OS command injection vulnerability in ASUS RT-AX55 routers. That classification indicates attacker-controlled input may be able to reach operating-system command execution paths. The provided corpus does not include the vulnerable interface, affected firmware versions, attack vector, or impact details beyond the vulnerability name and KEV listing.

Defensive priority

High

Recommended defensive actions

• Check whether ASUS RT-AX55 routers are deployed in your environment and identify the installed firmware version.
• Review ASUS product security advisory guidance and the RT-AX55 support/helpdesk page referenced by CISA for mitigation and firmware updates.
• Apply vendor-provided mitigations or updates as soon as they are available.
• If no effective mitigation is available for a deployed device, remove it from service or replace it.
• Treat the device as a priority asset until you confirm it is remediated.

Evidence notes

Authoritative evidence comes from the CISA KEV catalog entry and its metadata, which names ASUS RT-AX55 Routers, classifies the issue as OS command injection, and sets dateAdded to 2025-06-02 with a due date of 2025-06-23. The corpus also references ASUS’s product security advisory and RT-AX55 support/helpdesk page, but their contents were not supplied here. No CVSS score was provided in the source material.

Official resources