Backdoor Vulnerability in TOTOLINK N350R Telnet Service
CVE-2025-8938

5.3MEDIUM

Key Information:

Vendor

Totolink
Status
N350r
Vendor
CVE Published:
14 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8938?

A critical security flaw exists in the TOTOLINK N350R router, specifically within the Telnet Service's formSysTel function. An attacker can manipulate the TelEnabled argument to create a backdoor within the system, enabling unauthorized access. This vulnerability can be leveraged remotely, posing a significant threat to users as the exploit has been publicly disclosed and could be deployed by malicious actors.

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Affected Version(s)

N350R 1.2.3-B20130826

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-2025-8938 - Proof of Concept

References

https://vuldb.com/?id.319901
vdb-entrytechnical-description
https://vuldb.com/?ctiid.319901
signaturepermissions-required
https://vuldb.com/?submit.631837
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

rew1X (VulDB User)
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