CVE-2026-3398Public exploitNetwork attack vector

Code execution via unchecked PPPoE password length

Published Mar 1, 2026 · Updated Mar 1, 2026

Stack-based buffer overflow in Tenda F453 1.0.0.3 allows remote authenticated users to crash httpd or execute code via a crafted AdvSetWan request. When wanmode equals 2, fromAdvSetWan passes the user-controlled PPPOEPassword value to sub_3C6C0 without checking its length, overflowing stack buffer s. Access to the management interface with low privileges is required; successful exploitation interrupts routing service or executes code on the device.

CVSS severity8.8
High
EPSS probability0.63%
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 F453 1.0.0.3 allows remote authenticated users to crash httpd or execute code via a crafted AdvSetWan request. When wanmode equals 2, fromAdvSetWan passes the user-controlled PPPOEPassword value to sub_3C6C0 without checking its length, overflowing stack buffer s. Access to the management interface with low privileges is required; successful exploitation interrupts routing service or executes code on the device.

The record

CVE
CVE-2026-3398
Published
Mar 1, 2026
Updated
Mar 1, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
F453
Classifications
CWE-120, CWE-119, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 1, 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=1.0.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · F453version=1.0.0.3

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
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

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1210Exploitation of Remote Services

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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