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Comfast CF-N1-S EUVDEUVD-2026-64604

| CVE-2026-78050 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-08-22 VulDB GHSA-j397-vxh8-xhw3
Stack Overflow Buffer Overflow Cf N1 S
8.6
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
8.6 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.9 CRITICAL

Network-accessible CGI endpoint with low-privilege authentication (PR:L); scope change (S:C) reflects device's role as network infrastructure with cascading impact on downstream systems.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

6
Analysis Updated
Aug 23, 2026 - 00:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 23, 2026 - 00:22 vuln.today
cvss_changed
Severity Changed
Aug 23, 2026 - 00:22 NVD
CRITICAL HIGH
CVSS changed
Aug 23, 2026 - 00:22 NVD
9.4 (CRITICAL) 8.6 (HIGH)
Analysis Generated
Aug 22, 2026 - 23:50 vuln.today
CVE Published
Aug 22, 2026 - 23:15 cve.org
CRITICAL 9.4

DescriptionCVE.org

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.

AnalysisAI

Stack-based buffer overflow in the Comfast CF-N1-S 2.6.0.1 web management interface enables remote code execution via the NTP timezone configuration CGI endpoint. The vulnerable function sub_41AD7C in /cgi-bin/mbox-config?method=SET&section=ntp_timezone fails to validate the length of the timestr and ntp_client_enabled parameters before copying them to the stack. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain low-privileged management credentials
Delivery
Access web management interface over HTTP
Exploit
Craft oversized NTP timezone parameter payload
Install
Send POST to /cgi-bin/mbox-config?method=SET&section=ntp_timezone
C2
Overflow stack buffer in sub_41AD7C
Execute
Overwrite return address
Impact
Execute arbitrary code on device
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Vulnerability AssessmentAI

Exploitation Exploitation requires network access to the Comfast CF-N1-S web management interface and a low-privileged authenticated session, as indicated by PR:L in the CVSS 4.0 vector. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) describes a network-reachable, low-complexity vulnerability requiring only low-privileged access - a combination that significantly lowers the practical exploitation barrier. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained low-privileged credentials to the Comfast CF-N1-S web management interface - potentially via default credentials or credential stuffing - sends a crafted HTTP request to /cgi-bin/mbox-config?method=SET&section=ntp_timezone with an oversized timestr or ntp_client_enabled parameter value. This overflows the stack buffer in function sub_41AD7C, enabling the attacker to overwrite the saved return address and redirect execution to attacker-controlled code, achieving remote code execution on the device. …
Remediation No vendor-released patch has been identified at time of analysis for CVE-2026-78050. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all Comfast CF-N1-S 2.6.0.1 devices in your network infrastructure and document their business purpose and network location; immediately implement firewall rules to restrict access to the device web management interface (port 80/443) to designated administrative workstations only. …

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EUVD-2026-64604 vulnerability details – vuln.today
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