Out-of-Bounds Write Vulnerability in TRENDnet TEW-657BRM Router
CVE-2026-129351

10CRITICAL

Key Information:

Vendor

Trendnet

Status
Tew-657brm
Vendor
CVE Published:
14 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-129351?

A vulnerability has been identified in the TRENDnet TEW-657BRM router affecting the sprintf function within /setup.cgi of the mini_httpd component. This flaw allows for out-of-bounds writes, which can potentially be exploited remotely. As the affected product has been discontinued for over 15 years, the vendor has indicated that it cannot confirm the existence of this vulnerability, though it may still pose a risk to unprotected devices. Users of this model are encouraged to review their security postures and consider upgrading to supported hardware.

Affected Version(s)

TEW-657BRM 1.00.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-129351 - Proof of Concept

References

https://vuldb.com/vuln/437397
vdb-entrytechnical-description
https://vuldb.com/vuln/437397/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-129351
third-party-advisory

CVSS V4

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ruanyi (VulDB User)
VulDB CNA Team
.