---
id: CVE-2026-17518
title: >-
  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…
summary: >-
  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…
severity: high
cvss: 8.2
cvssVector: 'CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:H'
cvssSource: cna
cwe:
  - CWE-121
vendor: ASUS
product: Router
affected:
  - Router ASUSWRT 3.0.0.4_386 series
  - Router ASUSWRT 3.0.0.4_388 series
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-20T19:17:05.687736Z'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T19:17:23.552Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-17518'
references:
  - url: 'https://www.asus.com/security-advisory'
tags:
  - cve.org
epss: 0.00147
epssPercentile: 0.03556
ingestedAt: '2026-10-20T02:51:19.463Z'
---

## Overview

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.

## Affected

- `Router ASUSWRT 3.0.0.4_386 series`
- `Router ASUSWRT 3.0.0.4_388 series`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.