Heap-Based Buffer Overflow in DrayTek Vigor2960 Affected by File Existence Check Function
CVE-2026-129453

9.4CRITICAL

Key Information:

Vendor

Draytek
Status
Vigor2960
Vendor
CVE Published:
15 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-129453?

A heap-based buffer overflow vulnerability exists in the DrayTek Vigor2960, specifically within the file existence check function in the mainfunction.cgi file. This flaw can be exploited remotely by manipulating the 'upload_name' argument, which could lead to memory corruption. Users are strongly encouraged to upgrade to version 1.5.1.7 or later to mitigate this risk. The vendor has highlighted that the current version, 1.5.1.6, is not the latest and multiple security issues have been addressed in subsequent releases.

Affected Version(s)

Vigor2960 1.5.1.6

Vigor2960 1.5.1.7

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-2026-129453 - Proof of Concept

References

https://vuldb.com/vuln/437464
vdb-entrytechnical-description
https://vuldb.com/vuln/437464/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-129453
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

eqqie (VulDB User)
VulDB CNA Team
.