CVE-2026-78050
Received Received - Intake

Stack-Based Buffer Overflow in Comfast CF-N1-S Web Management

Publication date: 2026-08-23

Last updated on: 2026-08-23

Assigner: VulDB

Description
A vulnerability was found in Comfast CF-N1-S 2.6.0.1. The affected element is the function sub_41AD7C of the file /cgi-bin/mbox-config?method=SET&section=ntp_timezone of the component Web Management. The manipulation of the argument timestr/ntp_client_enabled results in stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been made public and could be used.

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Meta Information

Published
2026-08-23
Last Modified
2026-08-23
Generated
2026-08-23
AI Q&A
2026-08-23
EPSS Evaluated
N/A
NVD
CVE-2026-78050
EUVD
EUVD-2026-64604

Affected Vendors & Products

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

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

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Executive Summary

This vulnerability is a stack-based buffer overflow in the Comfast CF-N1-S router version 2.6.0.1. It occurs in the function sub_41AD7C when handling the ntp_timezone parameter via a crafted HTTP POST request to /cgi-bin/mbox-config?method=SET&section=ntp_timezone. The flaw allows an attacker to overwrite stack memory by sending an overly long timestr value, potentially leading to arbitrary code execution with the web service's privileges.

Detection Guidance

To detect this vulnerability, monitor network traffic for HTTP POST requests to the /cgi-bin/mbox-config endpoint with parameters method=SET and section=ntp_timezone. Check for unusually long timestr values exceeding 128 bytes or requests where ntp_client_enabled is set to 0.

Impact Analysis

This vulnerability could allow remote attackers to execute arbitrary code on the affected router with the privileges of the web service. This may lead to full device compromise, unauthorized access, or control over network traffic. Attackers could manipulate router settings, intercept data, or use the device as a pivot point for further attacks within the network.

Compliance Impact

This vulnerability could lead to unauthorized code execution on the device, potentially allowing attackers to access, modify, or exfiltrate sensitive data. For GDPR, this may result in violations of data confidentiality and integrity requirements. For HIPAA, it could compromise protected health information if the device processes such data. The lack of proper input validation exacerbates these risks.

Mitigation Strategies

Immediately update the Comfast CF-N1-S router to the latest firmware version if available. Disable remote access to the web management interface if not required. Implement network-level controls to block malicious HTTP POST requests to the vulnerable endpoint.

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