---
id: "CVE-2026-17518"
kind: "vulnerability"
aliases: ["CVE-2026-17518"]
title: "ASUS router firmware: oversized HTTP input corrupts device, denial of service"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["asus", "firmware", "infrastructure", "router", "self-hosted"]
not_affected_if: ["no-untrusted-local-users"]
published_at: "2026-10-20T02:17:11+00:00"
first_seen_at: "2026-10-23T21:57:19+00:00"
updated_at: "2026-10-25T03:04:16+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-17518", "first_seen_at": "2026-10-23T21:57:19+00:00"}]
---

# ASUS router firmware: oversized HTTP input corrupts device, denial of service

Certain ASUS router models do not check the size of input in an HTTP request, causing a buffer overflow. An adjacent authenticated user can corrupt device operations and cause a denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Identify ASUS router models and firmware versions in use; the sources do not list affected models or versions.
- Compare the installed firmware against the ASUS Security Advisory for CVE-2026-17518 (unknown).

## Fix

- Install the firmware update named in the ASUS Security Advisory 'Security Update for ASUS Router Firmware' (version unknown from sources).
- Restrict access to the router admin interface to trusted users until patched.

## Timeline

- 2026-10-23T21:57:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-17518

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_