CVE intelligence and bounded remediation

CVE-2017-16923 — Tenda Ac9 Firmware security vulnerability

High CVSS 8.8

Command Injection vulnerability in app_data_center on Shenzhen Tenda Ac9 US_AC9V1.0BR_V15.03.05.14_multi_TD01, Ac9 ac9_kf_V15.03.05.19(6318_)_cn, Ac15 US_AC15V1.0BR_V15.03.05.18_multi_TD01, Ac15 US_AC15V1.0BR_V15.03.05.19_multi_TD01, Ac18 US_AC18V1.0BR_V15.03.05.05_multi_TD01, and Ac18 ac18_kf_V15.03.05.19(6318_)_cn devices allows remote unauthenticated attackers to execute arbitrary OS commands via a crafted cgi-bin/luci/usbeject?dev_name= GET request from the LAN. This occurs because the "sub_A6E8 usbeject_process_entry" function executes a system function with untrusted input.

Severity
High
CVSS
8.8 (3.0)
Published
2017-11-21
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-78

Affected products

  • tenda / ac9_firmware / us_ac9v1.0br_v15.03.05.14_multi_td01
  • tenda / ac9_firmware / ac9_kf_v15.03.05.19(6318_)_cn
  • tenda / ac15_firmware / us_ac15v1.0br_v15.03.05.18_multi_td01
  • tenda / ac15_firmware / us_ac15v1.0br_v15.03.05.19_multi_td01
  • tenda / ac18_firmware / us_ac18v1.0br_v15.03.05.05_multi_td01
  • tenda / ac18_firmware / ac18_kf_v15.03.05.19(6318_)_cn

Matched remediation archetype

Command, code, expression, and template injection

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Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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