CVE-2026-94003
Received Received - Intake

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

Publication date: 2026-09-20

Last updated on: 2026-09-20

Assigner: VulDB

Description
A vulnerability has been found in Comfast CF-N1-S 2.6.0.1. Impacted is the function get_css_path_from_uri of the file /cgi-bin/mbox-config of the component Web Management Interface. The manipulation leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-20
Last Modified
2026-09-20
Generated
2026-09-20
AI Q&A
2026-09-20
EPSS Evaluated
N/A
NVD
CVE-2026-94003
EUVD
EUVD-2026-83730

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
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

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a stack-based buffer overflow vulnerability in the Comfast CF-N1-S router firmware version 2.6.0.1. It exists in the get_css_path_from_uri function of the web management interface. The function copies URI path content into a fixed-size stack buffer without proper input length validation. An attacker can send a crafted HTTP GET request with an excessively long string in the path to trigger the overflow.

Detection Guidance

To detect this vulnerability, monitor network traffic for HTTP GET requests targeting the /cgi-bin/mbox-config/ endpoint with unusually long URI paths. Check for crashes in the web management process of Comfast CF-N1-S devices running firmware V2.6.0.1. Use packet inspection tools like tcpdump or Wireshark to analyze requests to this endpoint.

Impact Analysis

This vulnerability can lead to a denial-of-service condition by crashing the web management process. In some cases, it may allow control flow hijacking and arbitrary code execution with web service privileges, potentially giving an attacker full control of the device. The attack can be initiated remotely without authentication.

Compliance Impact

This vulnerability could lead to unauthorized access or control of the Comfast CF-N1-S router due to stack-based buffer overflow. For GDPR, it may result in unauthorized data access or processing, violating confidentiality and integrity principles. For HIPAA, it could expose protected health information if the device is used in healthcare environments. The lack of authentication requirements exacerbates these risks.

Mitigation Strategies

Immediately update the Comfast CF-N1-S firmware to a patched version if available. Disable remote access to the web management interface if not required. Implement network-level controls to block external access to /cgi-bin/mbox-config/. Monitor for unusual activity or crashes in the web management process.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-94003. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart