CVE-2026-5352

Tew 657brm Firmware vulnerability

CVSS

6.3

EPSS

4.1%

EPSS pct

90th

Exploited

No known

A security vulnerability has been detected in Trendnet TEW-657BRM 1.00.1. This impacts the function Edit of the file /setup.cgi. Such manipulation of the argument pcdb_list leads to os command injection. The attack may be launched remotely. The exploit has been disclosed publicly 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.

Affected vendor

Trendnet

Affected product

Tew 657brm Firmware

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Weakness type (CWE)

CWE-77 — Command Injection
CWE-78 — OS Command Injection

Published

2026-04-02

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to low impact to confidentiality, low impact to integrity, low impact to availability.

Its EPSS score of 4.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2026-5352

Confirm whether Trendnet Tew 657brm Firmware is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2026-5352.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-5352

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2026-5352 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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