Command Injection Vulnerability in Totolink NR1800X Router
CVE-2026-7548

8.7HIGH

Key Information:

Vendor

Totolink
Status
Nr1800x
Vendor
CVE Published:
1 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7548?

A command injection vulnerability exists within the Totolink NR1800X router in version 9.1.0u.6279_B20210910. This vulnerability is located in the function sub_41A68C of the /cgi-bin/cstecgi.cgi file. An attacker can exploit this flaw by manipulating the argument 'setUssd' to execute arbitrary commands on the affected device. This creates a significant risk as the exploit can be executed remotely, leaving systems vulnerable to unauthorized access and control. It's crucial for users to patch their devices and implement necessary security measures as the exploit has become publicly known.

Affected Version(s)

NR1800X 9.1.0u.6279_B20210910

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-2026-7548 - Proof of Concept

References

https://vuldb.com/vuln/360358
vdb-entrytechnical-description
https://vuldb.com/vuln/360358/cti
signaturepermissions-required
https://vuldb.com/submit/804417
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

NEWYM (VulDB User)
.