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TI-2026-76710 Aliases CVE-2026-17518

Stack-based buffer overflow in ASUS routers enables denial of service

Priority LOW 35CWE-121Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Certain ASUS router models running ASUSWRT 3.0.0.4_386 series and ASUSWRT 3.0.0.4_388 series are affected. A missing input size check when copying data lets an HTTP request with input longer than expected overflow a stack buffer (CWE-121). An adjacent authenticated user can corrupt device operations and cause a denial of service.

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

Description from the CNA

Buffer Copy without Checking Size of Input in certain ASUS router models allows an adjacent authenticated user to corrupt device operations and cause a denial of service via an HTTP request with input exceeding the expected length. 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 0.00186 8th 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
No
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
ASUSRouterASUSWRT 3.0.0.4_386 series; ASUSWRT 3.0.0.4_388 series—No fix listedCNA
  • Router VendorASUS Affected ASUSWRT 3.0.0.4_386 series; ASUSWRT 3.0.0.4_388 series Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for ASUS Router.

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

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-17518
  2. 2026-10-20 CISA SSVC decision points changed
  3. 2026-10-20 Priority changed: MEDIUM → LOW

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