Buffer Overflow Vulnerability in Totolink N300RT Router Software
CVE-2026-7218

8.6HIGH

Key Information:

Vendor

Totolink
Status
N300rt
Vendor
CVE Published:
28 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7218?

A significant vulnerability has been identified in Totolink N300RT Router version 3.4.0-B20250430, specifically within the implementation of the 'is_cmd_string_valid' function in the 'libapmib.so' component. This weakness arises from improper handling of the 'localPin' argument, leading to a buffer overflow scenario. Attackers can exploit this vulnerability remotely, allowing unauthorized access to system functions. The exploit has been publicly disclosed, increasing the urgency for affected users to apply appropriate security measures.

Affected Version(s)

N300RT 3.4.0-B20250430

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-2026-7218 - Proof of Concept

References

https://vuldb.com/vuln/359818
vdb-entrytechnical-description
https://vuldb.com/vuln/359818/cti
signaturepermissions-required
https://vuldb.com/submit/802127
third-party-advisory

CVSS V4

Score:
8.6
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

xyhackr (VulDB User)
.