Hidden backdoor authentication mechanism in multiple versions of Tenda firmware allows admin access to web management interface

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-11405
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-06 20:16:29 UTC
Updated2026-07-08 14:16:54 UTC
DescriptionThe 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

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.006680000 probability, percentile 0.475190000 (date 2026-07-09)

Problem Types: CWE-912: Hidden Functionality

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Tenda Firmware affected US_AC6V2.0RTL_V15.03.06.51_multi_T Not specified
CNA Tenda Firmware affected US_AC5V1.0RTL_V15.03.06.48_multi_TDE01 Not specified
CNA Tenda Firmware affected US_AC10V1.0re_V15.03.06.46_multi_TDE01 Not specified
CNA Tenda Firmware affected US_W15EV1.0br_V15.11.0.5(1068_1567_841)_EN_TDE Not specified
CNA Tenda Firmware affected US_FH1201V1.0BR_V1.2.0.14(408)_EN_TD Not specified

References

ReferenceSourceLinkTags
kb.cert.org/vuls/id/213560 [email protected] kb.cert.org
cwe.mitre.org/data/definitions/912.html [email protected] cwe.mitre.org
www.kb.cert.org/vuls/id/213560 af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
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