Buffer Overflow Vulnerability in Totolink N300RH Router Firmware
CVE-2026-7748

8.7HIGH

Key Information:

Vendor

Totolink
Status
N300rh
Vendor
CVE Published:
4 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7748?

A vulnerability has been identified in the Totolink N300RH router firmware version 3.2.4-B20220812, specifically within the setUpgradeFW function located in the /cgi-bin/cstecgi.cgi file. This weakness arises from the improper handling of the FileName argument, which can be exploited to trigger a buffer overflow. Attackers can initiate this exploitation remotely, making it particularly concerning. Publicly available exploits mean that this flaw poses a significant risk to users, necessitating immediate attention and remediation.

Affected Version(s)

N300RH 3.2.4-B20220812

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-2026-7748 - Proof of Concept

References

https://vuldb.com/vuln/360923
vdb-entrytechnical-description
https://vuldb.com/vuln/360923/cti
signaturepermissions-required
https://vuldb.com/submit/807202
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)
.