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CVE-2026-2147— Tenda AC21 Web Management DownloadLog information disclosure

Quick assessment

Affected
Tenda AC21
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 AC21是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC21 16.03.08.16版本存在访问控制错误漏洞，该漏洞源于对文件/cgi-bin/DownloadLog的错误操作，可能导致信息泄露。

CVSS 5.3 · Medium EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-2147

Vulnerability Information
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Vulnerability Title
Tenda AC21 Web Management DownloadLog information disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in Tenda AC21 16.03.08.16. This impacts an unknown function of the file /cgi-bin/DownloadLog of the component Web Management Interface. Executing a manipulation can lead to information disclosure. The attack may be performed from remote. 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:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Tenda AC21 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda AC21是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC21 16.03.08.16版本存在访问控制错误漏洞，该漏洞源于对文件/cgi-bin/DownloadLog的错误操作，可能导致信息泄露。
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 AC21 16.03.08.16 cpe:2.3:o:tenda:ac21_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-2147

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III. Intelligence Information for CVE-2026-2147

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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-2026-2138 8.8 HIGH Tenda TX9 SetStaticRouteCfg sub_42D03C 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

IV. Related Vulnerabilities

Same product: AC21
Same vendor: Tenda
Same weakness: CWE-200

V. Comments for CVE-2026-2147

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