CVE intelligence and bounded remediation

CVE-2017-16936 — Tenda Ac9 Firmware security vulnerability

Medium CVSS 6.5

Directory Traversal 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 read arbitrary files via a cgi-bin/luci/request?op=1&path= URI that uses directory traversal sequences after a /usb/ substring.

Severity
Medium
CVSS
6.5 (3.0)
Published
2017-11-24
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-22

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

Path traversal, unsafe upload, and file handling

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Check exposure

  • Trace untrusted filenames, archive entries, URLs, and path segments into read, write, include, extraction, and upload operations.
  • Identify filesystem roots, mount permissions, symbolic-link behavior, archive handling, and whether uploaded content is web-accessible or executable.
  • Review canonicalization and containment checks across supported operating systems and storage backends.

Remediate safely

  • Generate server-side storage identifiers and resolve paths beneath a fixed root using filesystem-aware containment checks.
  • Reject absolute, parent-relative, alternate-separator, device, link, and archive entries that escape the intended root.
  • Store uploads outside executable or served paths, validate type and size, and use private atomic temporary files.

Authoritative sources

Complete CVE record and remediation plan

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