Buffer Overflow Vulnerability in Totolink Product
CVE-2026-7749

8.7HIGH

Key Information:

Vendor

Totolink
Status
N300rh
Vendor
CVE Published:
4 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7749?

A security vulnerability has been identified in the Totolink N300RH router, specifically within the function setWanConfig located in /cgi-bin/cstecgi.cgi. This issue arises from improper handling of the priDns argument, leading to a potential buffer overflow. The vulnerability can be exploited remotely, allowing an attacker to manipulate the device without physical access. With the exploit publicly disclosed, users of the affected firmware version should apply necessary precautions and updates to mitigate risks.

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-2026-7749 - Proof of Concept

References

https://vuldb.com/vuln/360924
vdb-entrytechnical-description
https://vuldb.com/vuln/360924/cti
signaturepermissions-required
https://vuldb.com/submit/807203
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)
.