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Comfast CF-N1-S EUVDEUVD-2026-63573

| CVE-2026-77148 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-08-20 VulDB GHSA-j7x2-7p87-73vg
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
8.8 HIGH

PR:L reflects required low-privilege authentication per CVSS 4.0 vector; S:U as RCE is directly scoped to the router's own OS.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/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 20, 2026 - 19:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 20, 2026 - 19:22 vuln.today
cvss_changed
Severity Changed
Aug 20, 2026 - 19:22 NVD
CRITICAL HIGH
CVSS changed
Aug 20, 2026 - 19:22 NVD
9.4 (CRITICAL) 8.6 (HIGH)
Analysis Generated
Aug 20, 2026 - 18:50 vuln.today
CVE Published
Aug 20, 2026 - 18:15 cve.org
CRITICAL 9.4

DescriptionCVE.org

A vulnerability was found in Comfast CF-N1-S 2.6.0.1. This impacts the function sub_44B50C of the file /cgi-bin/mbox-config?method=SET&section=ptest_channel of the component Web Management. The manipulation results in stack-based buffer overflow. The attack can be launched remotely. The exploit has been made public and could be used.

AnalysisAI

Stack-based buffer overflow in the Comfast CF-N1-S firmware version 2.6.0.1 allows remote attackers with low-privilege web management credentials to achieve arbitrary code execution on the device. The vulnerable function sub_44B50C, reachable via the CGI endpoint /cgi-bin/mbox-config?method=SET&section=ptest_channel, fails to bounds-check user-supplied input before copying it onto the stack. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privilege web management credentials
Delivery
Send crafted HTTP POST to /cgi-bin/mbox-config?section=ptest_channel
Exploit
Overflow stack buffer in sub_44B50C
Execution
Overwrite saved return address
Persist
Redirect execution to attacker shellcode
Impact
Achieve root-level code execution on router
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Vulnerability AssessmentAI

Exploitation Exploitation requires authenticated access to the Comfast CF-N1-S web management HTTP interface - the CVSS 4.0 PR:L metric confirms that low-privilege credentials are sufficient; unauthenticated exploitation is not supported by the available data. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.6 reflects high impact across all three pillars - confidentiality, integrity, and availability - on both the vulnerable system and subsequent systems (SC:H/SI:H/SA:H), acknowledging that a compromised router affects all downstream network traffic and connected devices. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained low-privilege credentials to the Comfast CF-N1-S web management interface - through default credentials, credential stuffing, or prior access - sends a crafted HTTP POST request to `/cgi-bin/mbox-config?method=SET&section=ptest_channel` with an oversized `ptest_channel` value. The function sub_44B50C copies this input into a fixed-size stack buffer without bounds checking, overwriting the saved return address and enabling control-flow redirection to attacker-controlled shellcode. …
Remediation No vendor-released patch has been identified at the time of analysis - no fixed firmware version appears in the available references from VulDB or ENISA EUVD-2026-63573. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit all Comfast CF-N1-S deployments and identify firmware versions in use; immediately restrict network access to the web management interface via firewall rules limiting access to trusted administrative IP ranges only. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

More in Cf N1 S

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Command injection in the Comfast CF-N1-S router version 2.6.0.1 allows an authenticated remote attacker to execute arbit

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EUVD-2026-63573 vulnerability details – vuln.today
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