# CVE-2018-14558: Tenda AC7, AC9, and AC10 Routers Command Injection Vulnerability

Source: https://junglewise.ai/threats/cve-2018-14558-tenda-ac7-ac9-and-ac10-routers-command-injection-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2018-14558 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03

Tenda AC7, AC9, and AC10 routers are vulnerable to command injection via the 'formsetUsbUnload' function. The vulnerability occurs because the 'dosystemCmd' function processes untrusted input from crafted 'goform/setUsbUnload' requests, allowing for arbitrary OS command execution.

Technologies: [Tenda Ac7](https://junglewise.ai/threats/technologies/ac7), [Tenda Ac9](https://junglewise.ai/threats/technologies/ac9). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2018-14558 exploited in the wild?** Yes. CVE-2018-14558 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2018-14558?** Critical severity, with a CVSS score of 9.8, published 3 November 2021.

**Which products and versions are affected?** Tenda AC7 Firmware through V15.03.06.44_CN(AC7); Tenda AC9 Firmware through V15.03.05.19(6318)_CN(AC9); Tenda AC10 Firmware through V15.03.06.23_CN(AC10).

**Is there a fix for CVE-2018-14558?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2018-14558 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2018-14558?** Check whether you run Tenda Ac10 Routers, Tenda Ac7 or Tenda Ac9. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Tenda AC7 Firmware through V15.03.06.44_CN(AC7)
- Tenda AC9 Firmware through V15.03.05.19(6318)_CN(AC9)
- Tenda AC10 Firmware through V15.03.06.23_CN(AC10)

## Timeline

- 2018-10-30: disclosed: NVD Published Date
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

## Related threats

- [Tenda AC9 stack buffer overflow in POST request handler](https://junglewise.ai/threats/cve-2026-104611-a-vulnerability-was-detected-in-tenda-ac9-15-03-02-13-affected)
- [Tenda AC9 authentication bypass in web management](https://junglewise.ai/threats/cve-2026-86300-tenda-ac9-authentication-bypass-in-web-management)
- [Tenda AC7 stack overflow in /goform/AdvSetMacMtuWan](https://junglewise.ai/threats/cve-2026-51846-tenda-ac7-stack-overflow-in-goform-advsetmacmtuwan)
- [Tenda AC7 stack buffer overflow in AdvSetMacMtuWan](https://junglewise.ai/threats/cve-2026-51845-tenda-ac7-stack-buffer-overflow-in-advsetmacmtuwan)
- [Tenda AC7 stack buffer overflow in AdvSetMacMtuWan](https://junglewise.ai/threats/cve-2026-51844-tenda-ac7-stack-buffer-overflow-in-advsetmacmtuwan)