CVE-2026-2202Public exploitNetwork attack vector

Authenticated router crash via unchecked shareSpeed copy

Published Feb 9, 2026 · Updated Feb 9, 2026

Stack-based buffer overflow in Tenda AC8 firmware 16.03.33.05 allows remote authenticated users to crash the router via shareSpeed. In httpd's fromSetWifiGusetBasic function, strcpy copies the unchecked /goform/WifiGuestSet shareSpeed value past a stack buffer. A valid management password is required; the public proof of concept demonstrates a segmentation fault, while code execution is not demonstrated.

CVSS severity8.7
High
EPSS probability0.65%
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 AC8 firmware 16.03.33.05 allows remote authenticated users to crash the router via shareSpeed. In httpd's fromSetWifiGusetBasic function, strcpy copies the unchecked /goform/WifiGuestSet shareSpeed value past a stack buffer. A valid management password is required; the public proof of concept demonstrates a segmentation fault, while code execution is not demonstrated.

The record

CVE
CVE-2026-2202
Published
Feb 9, 2026
Updated
Feb 9, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC8
Classifications
CWE-120, CWE-119, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 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=16.03.33.05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC8version=16.03.33.05

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
8.7VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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

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.

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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
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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