Command Injection Vulnerability in Comfast CF-N1-S Device
CVE-2026-77004

5.3MEDIUM

Key Information:

Vendor

Comfast

Status
Cf-n1-s
Vendor
CVE Published:
20 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-77004?

A command injection vulnerability exists in the Comfast CF-N1-S version 2.6.0.1, specifically within the sprintf function of the /cgi-bin/mbox-config?method=SET&section=ptest_sn endpoint. By manipulating the argument 'sn', an attacker can execute arbitrary commands remotely, leading to potential unauthorized access and control of the affected device. This exploit has been publicly disclosed and can be leveraged by malicious actors.

Affected Version(s)

CF-N1-S 2.6.0.1

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-2026-77004 - Proof of Concept

References

https://vuldb.com/vuln/393623
vdb-entrytechnical-description
https://vuldb.com/vuln/393623/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-77004
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

577488768 (VulDB User)
.