CVE-2024-4020Public exploitNetwork attack vector

Authenticated code execution via entrys parameter overflow

Published Apr 20, 2024 · Updated Aug 1, 2024

Buffer overflow in Tenda FH1206 1.2.0.8(8155) allows remote authenticated users to execute code via a crafted entrys body parameter. The fromAddressNat handler for /goform/addressNat processes an oversized entrys value beyond its destination buffer. Access to the router's management interface is required; exploitation can also crash its service.

CVSS severity8.8
High
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Tenda FH1206 1.2.0.8(8155) allows remote authenticated users to execute code via a crafted entrys body parameter. The fromAddressNat handler for /goform/addressNat processes an oversized entrys value beyond its destination buffer. Access to the router's management interface is required; exploitation can also crash its service.

The record

CVE
CVE-2024-4020
Published
Apr 20, 2024
Updated
Aug 1, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
FH1206
Classifications
CWE-787, CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 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. Affected versionversion=1.2.0.8(8155)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · FH1206version=*; version=1.2.0.8(8155)

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.

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-787Out-of-bounds Write
CWE-120Buffer Copy without Checking Size of Input ('Classic 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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