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CVE-2026-2138— Tenda TX9 SetStaticRouteCfg sub_42D03C buffer overflow

Quick assessment

Affected
Tenda TX9
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tenda TX9是中国腾达（Tenda）公司的一个无线路由器。 Tenda TX9 22.03.02.10_multi及之前版本存在安全漏洞，该漏洞源于对文件/goform/SetStaticRouteCfg内函数sub_42D03C的参数list的错误操作，可能导致缓冲区溢出。

CVSS 8.8 · High EPSS 0.78% · P54

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-2138

Vulnerability Information
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Vulnerability Title
Tenda TX9 SetStaticRouteCfg sub_42D03C buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in Tenda TX9 up to 22.03.02.10_multi. Affected is the function sub_42D03C of the file /goform/SetStaticRouteCfg. The manipulation of the argument list results in buffer overflow. The attack can be launched remotely. The exploit has been made public and could be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
Tenda TX9 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda TX9是中国腾达（Tenda）公司的一个无线路由器。 Tenda TX9 22.03.02.10_multi及之前版本存在安全漏洞，该漏洞源于对文件/goform/SetStaticRouteCfg内函数sub_42D03C的参数list的错误操作，可能导致缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Tenda TX9 22.03.02.10_multi cpe:2.3:o:tenda:tx9_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-2138

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III. Intelligence Information for CVE-2026-2138

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News Coverage for CVE-2026-2138 (1)

Same Patch Batch · Tenda · 2026-02-08 · 13 CVEs total

CVE-2026-2187 8.8 HIGH Tenda RX3 formSetQosBand set_qosMib_list stack-based overflow
CVE-2026-2186 8.8 HIGH Tenda RX3 SetIpMacBind fromSetIpMacBind stack-based overflow
CVE-2026-2185 8.8 HIGH Tenda RX3 MAC Filtering Configuration Endpoint setBlackRule set_device_name stack-based ov
CVE-2026-2181 8.8 HIGH Tenda RX3 openSchedWifi stack-based overflow
CVE-2026-2180 8.8 HIGH Tenda RX3 fast_setting_wifi_set stack-based overflow
CVE-2026-2140 8.8 HIGH Tenda TX9 setMacFilterCfg sub_4223E0 buffer overflow
CVE-2026-2139 8.8 HIGH Tenda TX9 fast_setting_wifi_set sub_432580 buffer overflow
CVE-2026-2137 8.8 HIGH Tenda TX3 SetIpMacBind buffer overflow
CVE-2026-2192 7.2 HIGH Tenda AC9 formGetRebootTimer stack-based overflow
CVE-2026-2191 7.2 HIGH Tenda AC9 formGetDdosDefenceList stack-based overflow
CVE-2026-2148 5.3 MEDIUM Tenda AC21 Web Management DownloadFlash information disclosure
CVE-2026-2147 5.3 MEDIUM Tenda AC21 Web Management DownloadLog information disclosure

IV. Related Vulnerabilities

Same product: TX9
Same vendor: Tenda
Same weakness: CWE-120

V. Comments for CVE-2026-2138

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