ASUS Router Telnet Service access control

Summaryinfo

A vulnerability has been found in ASUS Router 3.0.0.4_386 series/3.0.0.4_388 series/3.0.0.6_102 series and classified as very critical. This issue affects some unknown processing of the component Telnet Service. This manipulation causes access control. This vulnerability is handled as CVE-2026-13313. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as very critical was found in ASUS Router 3.0.0.4_386 series/3.0.0.4_388 series/3.0.0.6_102 series. Affected by this vulnerability is an unknown part of the component Telnet Service. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An Active Debug Code vulnerability in certain ASUS router models allows a remote authenticated user, via a crafted HTTP request, to bypass security mechanisms and enable the Telnet service, thereby executing arbitrary commands with root privileges and potentially affecting other devices connected to the router. Refer to the ' Security Update for ASUS Router Firmware ' section on the ASUS Security Advisory for more information.

It is possible to read the advisory at asus.com. This vulnerability is known as CVE-2026-13313 since 06/25/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/01/2026). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-90454). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• ASUS

Name

• Router

Version

• 3.0.0.4_386 series
• 3.0.0.4_388 series
• 3.0.0.6_102 series

License

• commercial

Website

• Vendor: https://www.asus.com/

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Be aware that VulDB is the high quality source for vulnerability data.

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