CVE-2024-3909Network attack vector

Appliance compromise via cmdinput stack overflow

Published Apr 17, 2024 · Updated Aug 1, 2024

Stack-based buffer overflow in Tenda AC500 2.0.1.9(1307) allows remote authenticated users to compromise the appliance via cmdinput. The formexeCommand function handling /goform/execCommand fails to constrain cmdinput to the stack buffer's capacity, permitting adjacent stack-memory corruption. Low-privileged management access is required; successful exploitation can crash the controller or alter its execution flow.

CVSS severity9.8
Critical
EPSS probability1.68%
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 AC500 2.0.1.9(1307) allows remote authenticated users to compromise the appliance via cmdinput. The formexeCommand function handling /goform/execCommand fails to constrain cmdinput to the stack buffer's capacity, permitting adjacent stack-memory corruption. Low-privileged management access is required; successful exploitation can crash the controller or alter its execution flow.

The record

CVE
CVE-2024-3909
Published
Apr 17, 2024
Updated
Aug 1, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC500
Classifications
CWE-121, CWE-787, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 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=2.0.1.9(1307)
  2. Affected versionversion=2.0.1.9\(1307\)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC500version=2.0.1.9(1307); version=2.0.1.9\(1307\)

Published CVSS scores

8.8VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDB CNAAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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