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TI-2026-76711 Aliases CVE-2026-75753

Missing authentication in ASUS routers lets nearby users switch modes

Priority LOW 30CWE-306Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

Certain ASUS routers in the 3.0.0.4.388 series lack authentication for a critical function. An unauthorized nearby attacker can send specific commands over HTTP, which makes the router return device identification information and switch into a specific mode. When the router hits abnormal conditions in that mode, it may be unable to recover itself. The attacker needs network adjacency but no privileges or user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Missing Authentication for a Critical Function  in certain ASUS routers allows an unauthorized nearby user to send specific commands via HTTP requests, causing the router to return device identification information and switch into a specific mode. As a result, when the router encounters abnormal conditions, it may be unable to perform self-recovery. Refer to the ' Security Update for ASUS Router Firmware' section on the ASUS Security Advisory for more information.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00231 14th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ASUSRouter3.0.0.4.388 series—No fix listedCNA
  • Router VendorASUS Affected 3.0.0.4.388 series Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for ASUS Router. Refer to the Security Update for ASUS Router Firmware section on the ASUS Security Advisory for the latest guidance.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-75753
  2. 2026-10-20 CISA SSVC decision points changed

References

Other 1

  • TI-2021-12008 The administrator application on ASUS GT-AC2900 devices before 3.0.0.4.386.42643 and Lyra… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-36933 "UNSUPPORTED WHEN ASSIGNED" Certain versions of the ASUS Live Update client were… KEVCVSS 4.0CRITICAL 9.3
  • TI-2023-20780 OS command injection in ASUS RT-AX55 KEVCVSS 3.1HIGH 8.8
  • TI-2018-04367 An issue was discovered in AsusWRT before 3.0.0.4.384_10007. CVSS 3.0CRITICAL 9.8
  • TI-2018-04368 An issue was discovered in AsusWRT before 3.0.0.4.384_10007. CVSS 3.0CRITICAL 9.8
  • TI-2014-07780 common.c in infosvr in ASUS WRT firmware 3.0.0.4.376_1071, 3.0.0.376.2524-g0013f52, and… CVSS 2.0HIGH 10.0
See all 365 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences