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Tenda W20E CVE-2026-67966

| EUVDEUVD-2026-60538 CRITICAL
Missing Authentication for Critical Function (CWE-306)
2026-08-17 mitre GHSA-48vf-q85h-3hw9
9.8
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
9.8 CRITICAL

Missing authentication on a network-reachable endpoint (PR:N, AV:N, AC:L, UI:N) yields unauthenticated root, giving full confidentiality, integrity, and availability impact on the device.

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

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Aug 18, 2026 - 16:31 vuln.today
CVSS changed
Aug 18, 2026 - 16:22 NVD
9.8 (CRITICAL)
CVE Published
Aug 17, 2026 - 00:00 cve.org
CRITICAL 9.8
CVE Published
Aug 17, 2026 - 00:00 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Tenda W20E V16.01.0.6(2782) /goform/telnet endpoint allows unauthenticated remote attackers to activate the Telnet daemon and obtain root shell access.

AnalysisAI

Unauthenticated remote root access affects the Tenda W20E router (firmware V16.01.0.6(2782)) through its /goform/telnet web endpoint, which activates the device's Telnet daemon without any authentication check. Any attacker who can reach the router's management interface can enable Telnet and log in for a root shell, giving full control of the device. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Impact
technique details hidden

Vulnerability AssessmentAI

Exploitation The concrete prerequisite is network reachability of the router's HTTP management interface so the /goform/telnet endpoint can be requested; no credentials, user interaction, or non-default settings are required (CVSS AV:N/AC:L/PR:N/UI:N), consistent with the CWE-306 missing-authentication root cause. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals conflict in a way worth calling out: the CVSS 3.1 base score is 9.8 (network, low complexity, no privileges, no user interaction, full C/I/A impact), which is maximal for a remote root vulnerability, yet the EPSS score is only 0.19% (9th percentile) and it is not in CISA KEV - indicating no evidence of widespread automated exploitation at this time. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patch identified at time of analysis, so remediation relies on compensating controls. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Inventory all Tenda W20E devices and disable remote access to the management interface via firewall rules or administrative settings; if remote access is required, restrict it to trusted administrative IPs only. …

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CVE-2026-67966 vulnerability details – vuln.today

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