CVE-2026-4042Public exploitNetwork attack vector

Authenticated memory corruption via unchecked index parameter

Published Mar 12, 2026 · Updated Mar 12, 2026

Stack-based buffer overflow in Tenda i12 Firmware 1.0.0.6(2204) allows remote authenticated users to corrupt process memory. The formWifiMacFilterGet handler processes the index parameter at /goform/WifiMacFilterGet without enforcing the stack buffer boundary. Low-privileged access to the device's web management interface is required, and no user interaction is needed.

CVSS severity8.8
High
EPSS probability0.79%
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 i12 Firmware 1.0.0.6(2204) allows remote authenticated users to corrupt process memory. The formWifiMacFilterGet handler processes the index parameter at /goform/WifiMacFilterGet without enforcing the stack buffer boundary. Low-privileged access to the device's web management interface is required, and no user interaction is needed.

The record

CVE
CVE-2026-4042
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
i12 Firmware
Classifications
CWE-119, CWE-121, CWE-787, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0.6(2204)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · i12 Firmwareversion=1.0.0.6(2204)

Published CVSS scores

7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
8.8VulDBCVSS: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

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 exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
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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