CVE-2026-2139Public exploitNetwork attack vector

Authenticated code execution via unchecked sprintf

Published Feb 8, 2026 · Updated Feb 8, 2026

Stack buffer overflow in TX9 firmware 22.03.02.10_multi allows remote authenticated users to execute code via a crafted Wi-Fi SSID. In sub_432580 for /goform/fast_setting_wifi_set, sprintf copies the ssid parameter into stack buffer v19 without a length check. Low-privileged access to the router's HTTP interface is required; an oversized POST can crash the service or corrupt control flow for code execution.

CVSS severity8.8
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 buffer overflow in TX9 firmware 22.03.02.10_multi allows remote authenticated users to execute code via a crafted Wi-Fi SSID. In sub_432580 for /goform/fast_setting_wifi_set, sprintf copies the ssid parameter into stack buffer v19 without a length check. Low-privileged access to the router's HTTP interface is required; an oversized POST can crash the service or corrupt control flow for code execution.

The record

CVE
CVE-2026-2139
Published
Feb 8, 2026
Updated
Feb 8, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
TX9
Classifications
CWE-120, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 8, 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=22.03.02.10_multi

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · TX9version=22.03.02.10_multi

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
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:3.1/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.

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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
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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