CVE-2024-4066Public exploitNetwork attack vector

Authenticated code execution via unchecked strcpy

Published Apr 23, 2024 · Updated Aug 1, 2024

Stack-based buffer overflow in the Tenda AC8 WAN settings handler 16.03.34.06 and 16.03.34.09 allows remote authenticated users to execute code. The fromAdvSetMacMtuWan path passes attacker-controlled wanMTU, wanSpeed, cloneType, mac, serviceName, and serverName values to strcpy without bounding them to the destination stack array. Access to the router's WAN configuration interface is required; successful exploitation permits code execution in the embedded web service or crashes that service.

CVSS severity8.8
High
EPSS probability1.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Stack-based buffer overflow in the Tenda AC8 WAN settings handler 16.03.34.06 and 16.03.34.09 allows remote authenticated users to execute code. The fromAdvSetMacMtuWan path passes attacker-controlled wanMTU, wanSpeed, cloneType, mac, serviceName, and serverName values to strcpy without bounding them to the destination stack array. Access to the router's WAN configuration interface is required; successful exploitation permits code execution in the embedded web service or crashes that service.

The record

CVE
CVE-2024-4066
Published
Apr 23, 2024
Updated
Aug 1, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC8
Classifications
CWE-787, CWE-121, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record 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=16.03.34.06
  2. Affected versionversion=16.03.34.09

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC8version=16.03.34.06; version=16.03.34.09

Published CVSS scores

8.8NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
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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