CVE-2026-67967Public exploitNetwork attack vector

Root code execution via unbounded MAC address copy

Published Aug 17, 2026 · Updated Aug 18, 2026

Stack-based buffer overflow in Tenda W20E V5.0 firmware 16.01.0.6(2782) allows remote attackers to execute root-level code. The setDhcpStaticBindList handler passes an unchecked bindMACAddr value to table->add(), where strcpy() copies it into a fixed-size stack structure without a canary or fortified bounds checking. The path requires an administrator session, but the documented factory-default admin account has an empty password; successful exploitation can execute code as root or crash the router.

CVSS severity9.8
Critical
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Tenda W20E V5.0 firmware 16.01.0.6(2782) allows remote attackers to execute root-level code. The setDhcpStaticBindList handler passes an unchecked bindMACAddr value to table->add(), where strcpy() copies it into a fixed-size stack structure without a canary or fortified bounds checking. The path requires an administrator session, but the documented factory-default admin account has an empty password; successful exploitation can execute code as root or crash the router.

The record

CVE
CVE-2026-67967
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1059.004, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 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

9.8CISA ADP VulnrichmentCVSS: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 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-121Stack-based Buffer Overflow
T1059.004Unix Shell
T1190Exploit Public-Facing Application

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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