CVE-2026-5353: trendnet tew-657brm_firmware Command Injection

Vulnerability summary

CVE-2026-5353 is a high (CVSS 8.8) Command Injection vulnerability in trendnet tew-657brm_firmware. EPSS estimates a 5.73% chance of exploitation in the next 30 days, higher than 93% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 02-04-2026
   PublishedVulnerability first disclosed.
2. 02-04-2026
   Last modifiedVulnerability information updated.

Description

A vulnerability was detected in Trendnet TEW-657BRM 1.00.1. Affected is the function ping_test of the file /setup.cgi. Performing a manipulation of the argument c4_IPAddr results in os command injection. Remote exploitation of the attack is possible. The exploit is now public and may be used. The vendor confirms, that "[t]he product in question (...) has been discontinued and end of life since June 23, 2011, that is more than 14 years ago. We no longer provide support for this product, so we are not able to confirm the vulnerabilities. We will make an announcement on our website's product support page and notify customers who registered their products with us." This vulnerability only affects products that are no longer supported by the maintainer.

• CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.