# CVE-2026-15486: TRENDnet TEW-821DAP OS command injection in tools_ddns

Source: https://junglewise.ai/threats/cve-2026-15486-trendnet-tew-821dap-os-command-injection-in-tools-ddns  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-12. Updated: 2026-07-12  
License: CC BY 4.0 with a link back

CVE-2026-15486 · Severity: medium · CVSS 6.3 · Published 2026-07-12

A security vulnerability exists in the TRENDnet TEW-821DAP wireless access point, a device used to provide Wi-Fi connectivity in business and home environments. An attacker can remotely inject malicious commands into the device's configuration settings, potentially allowing them to take control of the hardware or disrupt network operations. Because this product has reached its end-of-life (EOL) status, the manufacturer will not be providing a security patch, leaving affected devices permanently vulnerable.

Technologies: [TRENDnet TEW-821DAP](https://junglewise.ai/threats/technologies/tew-821dap). Vendors: [TRENDnet](https://junglewise.ai/threats/vendors/trendnet).

## Quick answers

**Is CVE-2026-15486 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15486 being exploited in the wild.

**How severe is CVE-2026-15486?** Medium severity, with a CVSS score of 6.3, published 12 July 2026.

**Which products and versions are affected?** TRENDnet TEW-821DAP 1.11B03.

**Is there a fix for CVE-2026-15486?** 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-2026-15486 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-15486?** Check whether you run TRENDnet TEW-821DAP at an affected version. 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.

## Technical details

An OS command injection vulnerability exists in the TRENDnet TEW-821DAP firmware version 1.11B03 within the 'ssi' program. The flaw is located in function sub_42026C, which handles DDNS configuration via the /goform/tools_ddns endpoint. The application fails to sanitize the 'hostname', 'username', and 'password' parameters before using sprintf to concatenate them into a configuration string. This string is subsequently written to a configuration file and executed via a system call to restart the DDNS service (/etc/init.d/ddns restart). An authenticated remote attacker can leverage this to execute arbitrary shell commands with the privileges of the web server. The vendor has stated the device is EOL and will not be patched.

## Affected products

- TRENDnet TEW-821DAP 1.11B03

## Timeline

- 2026-07-12: advisory: NVD publication date
- 2026-07-12: disclosed: Public disclosure via VulDB and GitHub research repository

## References

- [https://github.com/IOTRes/IOT_Firmware_Update/blob/main/Trendnet/TEW-821DAP_CI4.md](https://github.com/IOTRes/IOT_Firmware_Update/blob/main/Trendnet/TEW-821DAP_CI4.md)
- [https://vuldb.com/cve/CVE-2026-15486](https://vuldb.com/cve/CVE-2026-15486)
- [https://vuldb.com/submit/842383](https://vuldb.com/submit/842383)
- [https://vuldb.com/vuln/377793](https://vuldb.com/vuln/377793)
- [https://vuldb.com/vuln/377793/cti](https://vuldb.com/vuln/377793/cti)

## Related threats

- [TRENDnet TEW-821DAP stack-based buffer overflow in NTP timezone configuration](https://junglewise.ai/threats/cve-2026-77946-trendnet-tew-821dap-stack-based-buffer-overflow-in-ntp-timezone)
- [TRENDnet TEW-821DAP command injection in upload.cgi](https://junglewise.ai/threats/cve-2026-77945-trendnet-tew-821dap-command-injection-in-upload-cgi)
- [TRENDnet TEW-821DAP OS command injection in system_ntp](https://junglewise.ai/threats/cve-2026-15487-trendnet-tew-821dap-os-command-injection-in-system-ntp)
- [TRENDnet TEW-821DAP command injection in DNS Lookup Handler](https://junglewise.ai/threats/cve-2026-15485-trendnet-tew-821dap-command-injection-in-dns-lookup-handler)
- [TRENDnet TEW-821DAP buffer overflow in tools_nslookup](https://junglewise.ai/threats/cve-2026-15484-trendnet-tew-821dap-buffer-overflow-in-tools-nslookup)