CVE-2026-3166Public exploitNetwork attack vector

Authenticated code execution via unchecked sprintf

Published Feb 25, 2026 · Updated Feb 25, 2026

Stack-based buffer overflow in Tenda F453 1.0.0.3 allows remote authenticated users to execute code via a crafted RouteStatic request. The httpd fromRouteStatic function passes the user-controlled page parameter to sprintf without checking its length, overflowing the stack buffer s. Low-privileged web-management access is required; exploitation can crash the service or execute code on the appliance.

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 execute code via a crafted RouteStatic request. The httpd fromRouteStatic function passes the user-controlled page parameter to sprintf without checking its length, overflowing the stack buffer s. Low-privileged web-management access is required; exploitation can crash the service or execute code on the appliance.

The record

CVE
CVE-2026-3166
Published
Feb 25, 2026
Updated
Feb 25, 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. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 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

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
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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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