CVE-2026-77022
Received Received - Intake

Stack-Based Buffer Overflow in Comfast CF-N1-S Router

Vulnerability report for CVE-2026-77022, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: VulDB

Description

A security flaw has been discovered in Comfast CF-N1-S 2.6.0.1. Affected by this issue is the function sub_44B438 of the file /cgi-bin/mbox-config?method=SET&section=ptest_ssid of the component SSID Configuration. The manipulation of the argument ssid results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

CVSS Scores

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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
EUVD

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-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 2.6.0.1 device. It exists in the SSID Configuration component, specifically in the function sub_44B438 of the file /cgi-bin/mbox-config?method=SET&section=ptest_ssid. The flaw is triggered by manipulating the 'ssid' argument, leading to a buffer overflow. The attack can be executed remotely, and a public exploit is available.

Detection Guidance

To detect this vulnerability, monitor network traffic for HTTP POST requests to the endpoint /cgi-bin/mbox-config?method=SET&section=ptest_ssid with an unusually long ssid parameter. Check for crashes or unexpected behavior in the web service handling these requests. Use tools like Wireshark to inspect HTTP traffic for malformed requests targeting this endpoint.

Impact Analysis

This vulnerability allows remote attackers to execute arbitrary code or cause a denial of service by overflowing the stack. It can lead to unauthorized access, data breaches, or system crashes. Since the exploit is public, the risk of exploitation is higher.

Compliance Impact

This vulnerability can lead to unauthorized access and data breaches, which may violate GDPR and HIPAA requirements for data protection and security. Non-compliance could result in legal penalties, fines, or reputational damage.

Mitigation Strategies

Immediately disable remote access to the vulnerable CGI endpoint /cgi-bin/mbox-config?method=SET&section=ptest_ssid if possible. Update the Comfast CF-N1-S device to the latest firmware version that patches this stack-based buffer overflow issue. Restrict network access to the device to trusted internal networks only.

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