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CVE-2026-2886— Tenda A21 SetOnlineDevName set_device_name stack-based overflow

Quick assessment

Affected
Tenda A21
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 A21是中国腾达（Tenda）公司的一个无线信号扩展器。 Tenda A21 1.0.0.0版本存在安全漏洞，该漏洞源于对文件/goform/SetOnlineDevName中参数devName的错误操作，可能导致栈缓冲区溢出。

CVSS 8.8 · High EPSS 0.56% · P44
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I. Basic Information for CVE-2026-2886

Vulnerability Information
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Vulnerability Title
Tenda A21 SetOnlineDevName set_device_name stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in Tenda A21 1.0.0.0. This affects the function set_device_name of the file /goform/SetOnlineDevName. This manipulation of the argument devName causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks.
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
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Tenda A21 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda A21是中国腾达（Tenda）公司的一个无线信号扩展器。 Tenda A21 1.0.0.0版本存在安全漏洞，该漏洞源于对文件/goform/SetOnlineDevName中参数devName的错误操作，可能导致栈缓冲区溢出。
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 A21 1.0.0.0 -

II. Public POCs for CVE-2026-2886

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III. Intelligence Information for CVE-2026-2886

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Same Patch Batch · Tenda · 2026-02-21 · 8 CVEs total

CVE-2026-2877 8.8 HIGH Tenda A18 Httpd Service WifiExtraSet strcpy stack-based overflow
CVE-2026-2876 8.8 HIGH Tenda A18 setBlackRule parse_macfilter_rule stack-based overflow
CVE-2026-2874 8.8 HIGH Tenda A21 fast_setting_wifi_set form_fast_setting_wifi_set stack-based overflow
CVE-2026-2873 8.8 HIGH Tenda A21 openSchedWifi setSchedWifi stack-based overflow
CVE-2026-2872 8.8 HIGH Tenda A21 MAC Filtering Configuration Endpoint setBlackRule set_device_name stack-based ov
CVE-2026-2871 8.8 HIGH Tenda A21 SetIpMacBind fromSetIpMacBind stack-based overflow
CVE-2026-2870 8.8 HIGH Tenda A21 formSetQosBand set_qosMib_list stack-based overflow

IV. Related Vulnerabilities

Same product: A21
Same vendor: Tenda
Same weakness: CWE-121

V. Comments for CVE-2026-2886

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