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CVE-2026-11405— Hidden backdoor authentication mechanism in multiple versions of Tenda firmware allows admin access to web management interface

Quick assessment

Affected
Tenda firmware
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 fh1201是中国Tenda公司的一款无线路由器。 Tenda FH1201存在处理逻辑错误漏洞，该漏洞源于/bin/httpd中的login()函数包含隐藏的后门身份验证机制，使用户提供密码与设备配置中的后门密码进行明文比较，成功匹配后授予管理员级别访问权限。以下产品及版本受到影响：US_AC6V2.0RTL_V15.03.06.51_multi_T版本、US_AC5V1.0RTL_V15.03.06.48_multi_TDE01版本、US_AC10V1.0re_V15.03.06.46_m

AI Predicted 9.8 Difficulty: Trivial EPSS 0.77% · P53

Affected Version Matrix 5

VendorProduct Version RangeStatus
Tenda firmware US_AC6V2.0RTL_V15.03.06.51_multi_T affected
US_AC5V1.0RTL_V15.03.06.48_multi_TDE01 affected
US_AC10V1.0re_V15.03.06.46_multi_TDE01 affected
US_W15EV1.0br_V15.11.0.5(1068_1567_841)_EN_TDE affected
US_FH1201V1.0BR_V1.2.0.14(408)_EN_TD affected
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I. Basic Information for CVE-2026-11405

Vulnerability Information
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Vulnerability Title
Hidden backdoor authentication mechanism in multiple versions of Tenda firmware allows admin access to web management interface
Source: CVE Program / CVE List V5
Vulnerability Description
The web server binary /bin/httpd contains a hidden backdoor authentication mechanism in the login() function at 004c88b8. - The function contains a normal authentication path using MD5/hash-based password verification (prod_encode64/PasswordToMd5/check_rand_key). - After normal authentication fails, it calls GetValue("sys.rzadmin.password") to read a backdoor password from the device configuration. - It performs a direct strcmp() comparison (plaintext, not hashed) between the config value and the user-supplied password. A successful match grants role=2 (admin-level access) and creates a valid session. The rzadmin username is never checked — any username works with the backdoor
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Tenda FH1201 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda fh1201是中国Tenda公司的一款无线路由器。 Tenda FH1201存在处理逻辑错误漏洞，该漏洞源于/bin/httpd中的login()函数包含隐藏的后门身份验证机制，使用户提供密码与设备配置中的后门密码进行明文比较，成功匹配后授予管理员级别访问权限。以下产品及版本受到影响：US_AC6V2.0RTL_V15.03.06.51_multi_T版本、US_AC5V1.0RTL_V15.03.06.48_multi_TDE01版本、US_AC10V1.0re_V15.03.06.46_m
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 firmware US_AC6V2.0RTL_V15.03.06.51_multi_T -
Tenda firmware US_AC5V1.0RTL_V15.03.06.48_multi_TDE01 -
Tenda firmware US_AC10V1.0re_V15.03.06.46_multi_TDE01 -
Tenda firmware US_W15EV1.0br_V15.11.0.5(1068_1567_841)_EN_TDE -
Tenda firmware US_FH1201V1.0BR_V1.2.0.14(408)_EN_TD -

II. Public POCs for CVE-2026-11405

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III. Intelligence Information for CVE-2026-11405

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Vendor Advisories for CVE-2026-11405 (1)

IV. Related Vulnerabilities

Same product: firmware
Same vendor: Tenda

V. Comments for CVE-2026-11405

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