Command Injection Vulnerability in Totolink NR1800X Telnet Service
CVE-2026-5030

5.3MEDIUM

Key Information:

Vendor

Totolink
Status
Nr1800x
Vendor
CVE Published:
29 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5030?

A critical vulnerability has been reported in the Totolink NR1800X router that allows remote attackers to exploit the Telnet Service. The issue is linked to the argument manipulation of the NTPSyncWithHost function located in the /cgi-bin/cstecgi.cgi file, leading to command injection. Successful exploitation could allow an attacker to execute arbitrary commands on the vulnerable device, putting the security of connected networks at risk. Users are advised to update their firmware promptly to mitigate potential attacks.

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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-2026-5030 - Proof of Concept

References

https://vuldb.com/vuln/353952
vdb-entrytechnical-description
https://vuldb.com/vuln/353952/cti
signaturepermissions-required
https://vuldb.com/submit/778529
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
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)
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