Stack-based Buffer Overflow in TRENDnet TEW-657BRM Router
CVE-2026-129352

9.4CRITICAL

Key Information:

Vendor

Trendnet

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

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-129352?

A buffer overflow vulnerability has been identified in the TRENDnet TEW-657BRM router, specifically linked to the processing of the 'upgrade_flash.cgi' file. This flaw allows remote attackers to manipulate input argument boundaries, potentially leading to unauthorized access or service disruption. Although the vendor has indicated that the product is beyond its end-of-life support, the public nature of the exploit poses a risk to any existing deployments. Users are encouraged to take necessary precautions as the vendor prepares an announcement addressing this issue.

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-2026-129352 - Proof of Concept

References

https://vuldb.com/vuln/437398
vdb-entrytechnical-description
https://vuldb.com/vuln/437398/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-129352
third-party-advisory

CVSS V4

Score:
9.4
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
.