Is CVE-2026-5354 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5354 being exploited in the wild.

How severe is CVE-2026-5354?

Medium severity, with a CVSS score of 6.3, published 2 April 2026.

Is there a fix for CVE-2026-5354?

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-2026-5354 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-5354?

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.

CVE-2026-5354: Trendnet TEW-657BRM command injection in setup.cgi

CVE-2026-5354 · Severity: medium · CVSS 6.3 · Published 2026-04-02

A security vulnerability exists in the Trendnet TEW-657BRM wireless router, an older networking device used for internet connectivity. An attacker could exploit this flaw to take control of the router and execute unauthorized commands. Because this product reached its end-of-life in 2011, the manufacturer will not be providing a security patch, and users are advised to replace the hardware.

Technologies: TRENDnet Tew-657brm, TRENDnet Tew-657brm Firmware. Vendors: TRENDnet.

Quick answers

Is CVE-2026-5354 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5354 being exploited in the wild.
How severe is CVE-2026-5354?: 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-2026-5354?: 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-2026-5354 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-5354?: 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 flaw is located within the 'vpn_connect' function in the '/setup.cgi' component. The root cause is the improper neutralization of the 'policy_name' parameter before it is passed to a system shell execution function. A remote attacker with low privileges (authenticated) can exploit this by sending a specially crafted POST request to execute arbitrary commands on the underlying operating system. A public proof-of-concept exploit is available. The vendor has stated the product is end-of-life (EOL) and will not receive updates.

Affected products

Trendnet TEW-657BRM 1.00.1

Timeline

2011-06-23: other: Product reached End-of-Life (EOL) status
2026-04-02: disclosed: Vulnerability details and PoC published
2026-04-02: advisory

References

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