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ASUS

ASUS Router Updates Address VPN Config Injection and Telnet Vulnerabilities

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ASUS has issued security updates for two separate router vulnerabilities: one involving a malicious VPN client configuration file imported through the router’s web interface, and another involving active debug code that could let an authenticated attacker enable Telnet and run commands as root. Check the support downloads for your exact router model and install an available firmware update; the reported firmware series do not identify every affected model or establish a universal fixed version.

What the two ASUS router vulnerabilities do

The flaws have different mechanisms and prerequisites. The VPN issue concerns importing a crafted configuration file into an ASUS router acting as a VPN client. The Telnet issue concerns an authenticated attacker abusing active debug code. Neither description means that ordinary VPN apps on phones or computers are affected.

Issue Reported severity Firmware series named in reporting What to do
CVE-2026-14157: command injection through an imported VPN client configuration file 9.4/10, CVSS 4.0; ASUS’s score as reported by Tom’s Hardware on October 3, 2026 3.0.0.6_102 Check the ASUS support page for your exact model and install available firmware.
CVE-2026-13313: debug code can enable Telnet and root-level command execution 8.9/10, CVSS 4.0; ASUS’s score as reported by Tom’s Hardware on October 3, 2026 3.0.0.6_102, 3.0.0.4_386, and 3.0.0.4_388 Check the ASUS support page for your exact model and install available firmware.

These are series named in Tom’s Hardware’s report of ASUS’s advisory, not a complete model-by-model inventory. The ASUS security advisory page recommends keeping products updated, but the captured advisory listing did not provide detailed model entries or exact fixed firmware versions. Do not assume a particular router is affected or patched based on the series alone.

CVE-2026-14157: a malicious VPN configuration file

ASUS routers can act as VPN clients by importing a configuration file from a VPN provider. The reported attack path requires a specially crafted file to be uploaded or imported through the router’s web management interface; its contents may enable arbitrary command execution. This is not a reported vulnerability in VPN apps running separately on a computer or phone.

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CVE-2026-13313: debug code and Telnet

The second flaw involves active debug code. The National Vulnerability Database entry describes an authenticated remote user sending a crafted HTTP request to bypass security checks and enable Telnet. That can allow arbitrary commands with root privileges and may affect devices connected to the router. Telnet must first be enabled before commands that could affect the network are run.

The scores above are CVSS 4.0 severity scores attributed to ASUS by Tom’s Hardware. They are severity ratings, not independent estimates of how likely an attacker is to exploit either flaw.

How to check and update your router

  1. Identify the exact model from the label on the router or its administration interface.
  2. Open the ASUS security advisory page and your model’s ASUS support downloads page. Look for a firmware release for that specific model; the series-level reporting alone does not establish whether your model is affected or its fixed version.
  3. Follow ASUS’s model-specific instructions to download and install the available firmware. Use the version and procedure listed for your model rather than relying on a version number reported for a different router.
  4. After the update, confirm in the router’s administration interface that the installed firmware matches the version you selected. Check the model’s support page again if no update is listed, since support listings can change.

Precautions while checking support and applying an update

  • Import VPN client configuration files only from trusted sources, as ASUS recommends in the report.
  • Use a unique administrator password. ASUS’s reported recommendation is at least 10 characters, with uppercase letters, numbers, and symbols.
  • Do not run scripts, tools, or commands from untrusted sources on devices connected to your local network.

These are precautionary measures, not substitutes for a firmware fix. Strong passwords do not patch either vulnerability.

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When an ASUS router may need replacement

ASUS says end-of-life routers will not receive new firmware, according to Tom’s Hardware’s report. If your exact model is no longer supported and has no update available, replacing it with a router that still receives firmware updates is a more durable security measure than relying on passwords alone. If the model remains supported, first check its own download page for current firmware; the reporting does not establish a need to replace every ASUS router.

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