Is CVE-2026-5353 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-5353 being exploited in the wild.

How severe is CVE-2026-5353?

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

Is there a fix for CVE-2026-5353?

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-2026-5353 attacked?

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

Am I affected by CVE-2026-5353?

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-2026-5353: Trendnet TEW-657BRM command injection in setup.cgi

CVE-2026-5353 · Severity: medium · CVSS 6.3 · Published 2026-04-02

A security vulnerability exists in the Trendnet TEW-657BRM wireless router, a device used to provide internet connectivity and networking for homes or small offices. An attacker can exploit this flaw to take control of the device by injecting malicious commands through the diagnostic ping interface. Successful exploitation could lead to unauthorized access to the network, data interception, or a complete loss of internet service. This product is end-of-life and no longer receives security updates.

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

Quick answers

Is CVE-2026-5353 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-5353 being exploited in the wild.
How severe is CVE-2026-5353?: 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-2026-5353?: 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-2026-5353 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-5353?: 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 running firmware version 1.00.1. The flaw is located within the 'ping_test' function in the '/setup.cgi' component, where the 'c4_IPAddr' parameter is passed to the 'myPipe' function without adequate sanitization or validation. A remote attacker with low privileges (authenticated access) can exploit this by sending a specially crafted POST request to execute arbitrary system commands on the underlying operating system. While a public exploit exists, the vendor has stated the product reached end-of-life (EOL) in 2011 and will not be patched.

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 made public
2026-04-02: advisory

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.