Buffer Overflow Vulnerability in Totolink WA300 Router
CVE-2026-7717

8.7HIGH

Key Information:

Vendor

Totolink
Status
Wa300
Vendor
CVE Published:
4 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7717?

A buffer overflow vulnerability exists in the UploadCustomModule function of the Totolink WA300 router's POST Request Handler. This issue stems from improper handling of input on the /cgi-bin/cstecgi.cgi script, allowing attackers to manipulate the 'File' argument. If successfully exploited, this vulnerability could enable remote code execution, leading to severe impacts on the device's integrity and confidentiality. The exploit has been publicly disclosed, necessitating immediate action to mitigate potential risks.

Affected Version(s)

WA300 5.2cu.7112_B20190227

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-2026-7717 - Proof of Concept

References

https://vuldb.com/vuln/360893
vdb-entrytechnical-description
https://vuldb.com/vuln/360893/cti
signaturepermissions-required
https://vuldb.com/submit/807193
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
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

wxhwxhwxh_mie (VulDB User)
.