CVE-2026-3799Public exploitNetwork attack vector

Authenticated memory corruption via oversized funcpara1

Published Mar 9, 2026 · Updated Mar 9, 2026

Stack-based buffer overflow in Tenda i3 1.0.0.6(2204) allows remote authenticated users to corrupt memory via a crafted request. The formSetCfm handler for /goform/setcfm accepts an oversized funcpara1 POST value and writes beyond its stack buffer. A low-privileged web session is the gate, and the published PoC establishes the oversized request but not code execution or in-the-wild use.

CVSS severity8.8
High
EPSS probability0.63%
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 Tenda i3 1.0.0.6(2204) allows remote authenticated users to corrupt memory via a crafted request. The formSetCfm handler for /goform/setcfm accepts an oversized funcpara1 POST value and writes beyond its stack buffer. A low-privileged web session is the gate, and the published PoC establishes the oversized request but not code execution or in-the-wild use.

The record

CVE
CVE-2026-3799
Published
Mar 9, 2026
Updated
Mar 9, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
i3
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 9, 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. · i3version=1.0.0.6(2204)

Published CVSS scores

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
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:3.0/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.

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