CVE-2018-25318Public exploitNetwork attack vector

Unauthenticated DNS redirection via spoofed admin cookie

Published Apr 29, 2026 · Updated Apr 29, 2026

Authentication bypass in Tenda FH303/A300 firmware 5.07.68_EN allows remote attackers to change configured DNS servers. The /goform/AdvSetDns handler accepts a GET request with a crafted admin cookie without validating an authenticated session, then writes attacker-supplied DS1 and DS2 values. No credentials or user interaction are required; altered resolver settings redirect traffic from devices using the router toward attacker-selected DNS infrastructure.

CVSS severity9.3
Critical
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Tenda FH303/A300 firmware 5.07.68_EN allows remote attackers to change configured DNS servers. The /goform/AdvSetDns handler accepts a GET request with a crafted admin cookie without validating an authenticated session, then writes attacker-supplied DS1 and DS2 values. No credentials or user interaction are required; altered resolver settings redirect traffic from devices using the router toward attacker-selected DNS infrastructure.

The record

CVE
CVE-2018-25318
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-290, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
T1565.002Transmitted Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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