---
id: CVE-2026-90693
title: A flaw has been found in D-Link DIR-878 120B05
summary: >-
  A flaw has been found in D-Link DIR-878 120B05. This impacts the function
  SetWan3Settings of the component WAN Settings. This manipulation of the
  argument Primary/Secondary causes stack-based buffer overflow. Remote
  exploitation of the a…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-119
  - CWE-121
vendor: D-Link
product: DIR-878
affected:
  - DIR-878 120B05
published: '2026-09-14'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T17:17:38.440'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90693'
references:
  - url: >-
      https://github.com/Amalll-Sec/router-vulnerability-research/blob/main/advisories/d-link/dir-878/SetWan3Settings/README.md
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-90693'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/915573'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/403226'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/403226/cti'
    label: cna@vuldb.com
  - url: 'https://www.dlink.com/'
    label: cna@vuldb.com
  - url: >-
      https://github.com/Amalll-Sec/router-vulnerability-research/blob/main/advisories/d-link/dir-878/SetWan3Settings/README.md
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00473
epssPercentile: 0.40116
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-15T15:59:29.350310Z'
ingestedAt: '2026-09-14T15:23:07.464Z'
---

## Overview

A flaw has been found in D-Link DIR-878 120B05. This impacts the function SetWan3Settings of the component WAN Settings. This manipulation of the argument Primary/Secondary causes stack-based buffer overflow. Remote exploitation of the attack is possible.

## Remediation

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