---
id: CVE-2018-25318
title: Tenda FH303/A300 V5.07.68_EN Cookie Session Weakness DNS Change
summary: >-
  Tenda FH303/A300 firmware V5.07.68_EN contains a session weakness
  vulnerability that allows unauthenticated attackers to modify DNS settings by
  exploiting insufficient cookie validation. Attackers can send GET requests to
  the /goform/Adv…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-290
vendor: Tenda
product: FH303/A300
affected:
  - FH303/A300 5.07.68
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-04-30T13:13:33.905364Z'
exploitAvailable: true
published: '2026-04-29'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T21:44:52.133Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2018-25318'
references:
  - url: 'https://www.exploit-db.com/exploits/44381'
    label: ExploitDB-44381
  - url: >-
      https://www.vulncheck.com/advisories/tenda-fh303-a300-68-en-cookie-session-weakness-dns-change
    label: >-
      VulnCheck Advisory: Tenda FH303/A300 V5.07.68_EN Cookie Session Weakness
      DNS Change
tags:
  - cve.org
  - exploit-available
epss: 0.00651
epssPercentile: 0.49304
ingestedAt: '2026-10-01T23:03:32.844Z'
---

## Overview

Tenda FH303/A300 firmware V5.07.68_EN contains a session weakness vulnerability that allows unauthenticated attackers to modify DNS settings by exploiting insufficient cookie validation. Attackers can send GET requests to the /goform/AdvSetDns endpoint with a crafted admin cookie to change DNS servers and redirect user traffic to malicious sites.

## Affected

- `FH303/A300 5.07.68`

## Remediation

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