CVE-2026-77004
Received Received - Intake

Command Injection in Comfast CF-N1-S Firmware

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: VulDB

Description
A flaw has been found in Comfast CF-N1-S 2.6.0.1. This impacts the function sprintf of the file /cgi-bin/mbox-config?method=SET&section=ptest_sn. Executing a manipulation of the argument sn can lead to command injection. The attack can be launched remotely. The exploit has been published and may be used.

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Meta Information

Published
2026-08-20
Last Modified
2026-08-20
Generated
2026-08-20
AI Q&A
2026-08-20
EPSS Evaluated
N/A
NVD
CVE-2026-77004
EUVD
EUVD-2026-63479

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
comfast cf-n1-s 2.6.0.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-77 The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
CWE-74 The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

This vulnerability is a command injection flaw in Comfast CF-N1-S version 2.6.0.1. It exists in the sprintf function of the file /cgi-bin/mbox-config?method=SET&section=ptest_sn. An attacker can manipulate the 'sn' argument to execute arbitrary commands remotely. The exploit has been publicly disclosed.

Detection Guidance

Check for unusual network traffic to the Comfast CF-N1-S device, particularly to the /cgi-bin/mbox-config endpoint. Look for HTTP requests containing the parameter sn with suspicious values like command sequences or shell metacharacters.

Impact Analysis

An attacker could exploit this to run unauthorized commands on the affected device. This may allow data theft, device takeover, or disruption of services. The impact depends on the device's role in the network and the privileges of the user account.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating confidentiality requirements in GDPR and HIPAA. Organizations using this device may face compliance violations, fines, or legal consequences if exploited.

Mitigation Strategies

Immediately restrict access to the /cgi-bin/mbox-config endpoint via network firewall rules. Disable or remove the vulnerable device if no patch is available. Monitor logs for exploitation attempts targeting this path.

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