CVE-2018-25316Public exploitNetwork attack vector

Unauthenticated DNS modification via forged admin cookie

Published Apr 29, 2026 · Updated Apr 29, 2026

Authentication bypass in Tenda W308R v2 5.07.48 allows remote attackers to change router DNS settings without credentials. The goform/AdvSetDns handler accepts DNS parameters from a GET request when the Cookie header merely contains admin:language=en, without validating an authenticated administrator session. Network access to the management interface is sufficient, and changed resolvers can redirect client traffic.

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 W308R v2 5.07.48 allows remote attackers to change router DNS settings without credentials. The goform/AdvSetDns handler accepts DNS parameters from a GET request when the Cookie header merely contains admin:language=en, without validating an authenticated administrator session. Network access to the management interface is sufficient, and changed resolvers can redirect client traffic.

The record

CVE
CVE-2018-25316
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
W308R
Classifications
CWE-290, T1565.001
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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.07.48

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · W308Rversion=5.07.48

Published CVSS scores

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
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1565.001Stored Data Manipulation

Public exploit references

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Technologies

Your stack

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Your stack

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