CVE-2024-40416Public exploit

Service interruption via unchecked list parameter

Published Jul 15, 2024 · Updated Aug 2, 2024

Stack-based buffer overflow in Tenda AX1806 firmware 1.0.0.1 allows remote attackers to interrupt operation via an adjacent-network request. The sub_6320C handler passes the POST list parameter to formSetVirtualSer, where sscanf processes it without first checking its length. The request requires no privileges or user interaction, and CISA's published impact assessment limits the demonstrated consequence to loss of availability.

CVSS severity9.8
Critical
EPSS probability0.58%
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 AX1806 firmware 1.0.0.1 allows remote attackers to interrupt operation via an adjacent-network request. The sub_6320C handler passes the POST list parameter to formSetVirtualSer, where sscanf processes it without first checking its length. The request requires no privileges or user interaction, and CISA's published impact assessment limits the demonstrated consequence to loss of availability.

The record

CVE
CVE-2024-40416
Published
Jul 15, 2024
Updated
Aug 2, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AX1806 Firmware
Classifications
CWE-121, CWE-787, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=1.0.0.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AX1806 Firmwareversion=1.0.0.1

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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