Answer in brief
CVE-2026-11405 records a Critical severity (CVSS 9.8) vulnerability in Hidden backdoor authentication mechanism in multiple versions of Tenda firmware allows admin access to web management interface. The current sources do not mark it as known exploited. The current feed maps Tenda/firmware (generic), Tenda/firmware (generic), Tenda/firmware (generic), Tenda/firmware (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Tenda/firmware (generic), Tenda/firmware (generic), Tenda/firmware (generic), Tenda/firmware (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Tenda/firmwaregeneric | US_AC6V2.0RTL_V15.03.06.51_multi_T | Not reported |
| Tenda/firmwaregeneric | US_AC5V1.0RTL_V15.03.06.48_multi_TDE01 | Not reported |
| Tenda/firmwaregeneric | US_AC10V1.0re_V15.03.06.46_multi_TDE01 | Not reported |
| Tenda/firmwaregeneric | US_W15EV1.0br_V15.11.0.5(1068_1567_841)_EN_TDE | Not reported |
| Tenda/firmwaregeneric | US_FH1201V1.0BR_V1.2.0.14(408)_EN_TD | Not reported |
Published upstream
Jul 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 6, 2026
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
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-11405 records a Critical severity (CVSS 9.8) vulnerability in Hidden backdoor authentication mechanism in multiple versions of Tenda firmware allows admin access to web management interface. The current sources do not mark it as known exploited. The current feed maps Tenda/firmware (generic), Tenda/firmware (generic), Tenda/firmware (generic), Tenda/firmware (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Tenda/firmware (generic), Tenda/firmware (generic), Tenda/firmware (generic), Tenda/firmware (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Tenda/firmwaregeneric | US_AC6V2.0RTL_V15.03.06.51_multi_T | Not reported |
| Tenda/firmwaregeneric | US_AC5V1.0RTL_V15.03.06.48_multi_TDE01 | Not reported |
| Tenda/firmwaregeneric | US_AC10V1.0re_V15.03.06.46_multi_TDE01 | Not reported |
| Tenda/firmwaregeneric | US_W15EV1.0br_V15.11.0.5(1068_1567_841)_EN_TDE | Not reported |
| Tenda/firmwaregeneric | US_FH1201V1.0BR_V1.2.0.14(408)_EN_TD | Not reported |
Published upstream
Jul 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 6, 2026
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
Quoted source text, attributed separately from HOL analysis.