# CVE-2026-15481: Trendnet TEW-635BRM command injection in IPoA WAN Setup

Source: https://junglewise.ai/threats/cve-2026-15481-trendnet-tew-635brm-command-injection-in-ipoa-wan-setup  
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-2026-15481 · Severity: high · CVSS 8.8 · Published 2026-07-12

A security vulnerability exists in the Trendnet TEW-635BRM router, a device used for internet connectivity. An attacker can exploit this flaw to take complete control of the device by injecting malicious commands into the network configuration settings. Because this product reached its end-of-life in 2011, the manufacturer will not be providing a security update, and users are advised to replace the device with a supported model.

Vendors: [TRENDnet](https://junglewise.ai/threats/vendors/trendnet).

## Quick answers

**Is CVE-2026-15481 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15481 being exploited in the wild.

**How severe is CVE-2026-15481?** High severity, with a CVSS score of 8.8, published 12 July 2026.

**Which products and versions are affected?** TRENDnet TEW-635BRM 1.00.03.

**Is there a fix for CVE-2026-15481?** 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-2026-15481 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-15481?** Check whether you run TRENDnet TEW-635BRM 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

A command injection vulnerability exists in the 'ipoa_test' function within the '/sbin/rc' binary of Trendnet TEW-635BRM routers (firmware v1.00.03). The vulnerability stems from the unsafe use of 'sprintf' to concatenate the 'ipoa_ipaddr' NVRAM variable into a shell command string, which is subsequently executed via 'system()'. An attacker with the ability to modify NVRAM—typically achieved by uploading a tampered configuration file via the web interface—can inject shell metacharacters to execute arbitrary commands with root privileges. The vendor has stated the device is EOL (End of Life) since 2011 and will not be patched.

## Affected products

- Trendnet TEW-635BRM 1.00.03

## Timeline

- 2011: other: Product reached End-of-Life (EOL) status
- 2026-07-12: advisory: Vulnerability disclosed via NVD/VulDB

## References

- [https://github.com/glkfc/IoT-Vulnerability/blob/main/TRENDnet/TRENDnet_TEW635BRM_ipoa_cmdinj_EN.md](https://github.com/glkfc/IoT-Vulnerability/blob/main/TRENDnet/TRENDnet_TEW635BRM_ipoa_cmdinj_EN.md)
- [https://vuldb.com/cve/CVE-2026-15481](https://vuldb.com/cve/CVE-2026-15481)
- [https://vuldb.com/submit/838237](https://vuldb.com/submit/838237)
- [https://vuldb.com/vuln/377788](https://vuldb.com/vuln/377788)
- [https://vuldb.com/vuln/377788/cti](https://vuldb.com/vuln/377788/cti)

## Related threats

- [Trendnet TEW-635BRM stack overflow in start_httpd](https://junglewise.ai/threats/cve-2026-15480-trendnet-tew-635brm-stack-overflow-in-start-httpd)