# CVE-2026-5352: Trendnet TEW-657BRM OS command injection in setup.cgi

Source: https://junglewise.ai/threats/cve-2026-5352-trendnet-tew-657brm-os-command-injection-in-setup-cgi  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-02. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-5352 · Severity: medium · CVSS 6.3 · Published 2026-04-02

A security vulnerability exists in the Trendnet TEW-657BRM wireless router that allows an attacker to take control of the device. By sending a specially crafted request to the router's management interface, an attacker can execute unauthorized system commands. This could lead to a complete compromise of the device, interception of network traffic, or disruption of internet services. However, this product reached its end-of-life in 2011 and is no longer supported by the manufacturer.

Technologies: [TRENDnet Tew-657brm](https://junglewise.ai/threats/technologies/tew-657brm), [TRENDnet Tew-657brm Firmware](https://junglewise.ai/threats/technologies/tew-657brm-firmware). Vendors: [TRENDnet](https://junglewise.ai/threats/vendors/trendnet).

## Quick answers

**Is CVE-2026-5352 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5352 being exploited in the wild.

**How severe is CVE-2026-5352?** Medium severity, with a CVSS score of 6.3, published 2 April 2026.

**Which products and versions are affected?** TRENDnet Tew-657brm 1.00.1.

**Is there a fix for CVE-2026-5352?** 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-2026-5352 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-5352?** Check whether you run TRENDnet Tew-657brm or TRENDnet Tew-657brm Firmware 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-657BRM router firmware version 1.00.1. The 'Edit' function within the '/setup.cgi' script fails to properly sanitize the 'pcdb_list' parameter before passing it to a system shell (SYSTEM function). A remote attacker with low privileges (authenticated) can exploit this by sending a crafted POST request to execute arbitrary commands on the underlying operating system. The vendor has stated the product is end-of-life (EOL) as of June 2011 and will not be issuing a patch. A public exploit (PoC) is available.

## Affected products

- Trendnet TEW-657BRM 1.00.1

## Timeline

- 2011-06-23: other: Product reached End-of-Life (EOL) status
- 2026-04-02: disclosed: Public disclosure of the vulnerability and exploit
- 2026-04-02: advisory

## References

- [https://github.com/panda666-888/vuls/blob/main/trendnet/tew-657brm/edit.md](https://github.com/panda666-888/vuls/blob/main/trendnet/tew-657brm/edit.md)
- [https://vuldb.com/submit/781565](https://vuldb.com/submit/781565)
- [https://vuldb.com/vuln/354705](https://vuldb.com/vuln/354705)
- [https://vuldb.com/vuln/354705/cti](https://vuldb.com/vuln/354705/cti)

## Related threats

- [Trendnet TEW-657BRM command injection in setup.cgi](https://junglewise.ai/threats/cve-2026-5355-trendnet-tew-657brm-command-injection-in-setup-cgi)
- [Trendnet TEW-657BRM command injection in setup.cgi](https://junglewise.ai/threats/cve-2026-5354-trendnet-tew-657brm-command-injection-in-setup-cgi)
- [Trendnet TEW-657BRM command injection in setup.cgi](https://junglewise.ai/threats/cve-2026-5353-trendnet-tew-657brm-command-injection-in-setup-cgi)
- [Trendnet TEW-657BRM OS command injection in setup.cgi](https://junglewise.ai/threats/cve-2026-5351-trendnet-tew-657brm-os-command-injection-in-setup-cgi)
- [Trendnet TEW-657BRM stack overflow in setup.cgi](https://junglewise.ai/threats/cve-2026-5350-trendnet-tew-657brm-stack-overflow-in-setup-cgi)