Stack-Based Buffer Overflow Vulnerability in TOTOLINK NR1800X Router
CVE-2026-82616

9.4CRITICAL

Key Information:

Vendor

Totolink
Status
Nr1800x
Vendor
CVE Published:
31 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-82616?

A critical vulnerability has been identified in the TOTOLINK NR1800X router, specifically affecting the function setUploadSetting located in the file /cgi-bin/cstecgi.cgi. An exploitable stack-based buffer overflow occurs due to improper handling of the FileName argument, enabling an attacker to gain unauthorized access remotely. The vulnerability has been publicly disclosed, making systems running the affected firmware version susceptible to attacks that could lead to potential data breaches and system compromise.

Affected Version(s)

NR1800X 9.1.0u.6681_B20230703

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-2026-82616 - Proof of Concept

References

https://vuldb.com/vuln/397117
vdb-entrytechnical-description
https://vuldb.com/vuln/397117/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-82616
third-party-advisory

CVSS V4

Score:
9.4
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

577488768 (VulDB User)
.