Stack-Based Buffer Overflow in TOTOLINK N600R Router
CVE-2026-79911

10CRITICAL

Key Information:

Vendor

Totolink
Status
N600r
Vendor
CVE Published:
25 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-79911?

A security vulnerability exists in the TOTOLINK N600R router, specifically in the setSystemConfig function within the CGI Handler component. The flaw arises due to inadequate handling of the Hostname argument, which can lead to a stack-based buffer overflow. This vulnerability allows attackers to execute remote exploits, facilitated by the public disclosure of the exploit. Users of affected products should take swift action to secure their devices to prevent potential attacks.

Affected Version(s)

N600R 4.3.0cu.7647_B20210106

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-2026-79911 - Proof of Concept

References

https://vuldb.com/vuln/395061
vdb-entrytechnical-description
https://vuldb.com/vuln/395061/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-79911
third-party-advisory

CVSS V4

Score:
10
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

ST4R0002 (VulDB User)
.