Stack-based Buffer Overflow Vulnerability in Comfast CF-N1-S by Comfast
CVE-2026-77022

9.4CRITICAL

Key Information:

Vendor

Comfast

Status
Cf-n1-s
Vendor
CVE Published:
20 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-77022?

A security flaw has been identified in Comfast CF-N1-S version 2.6.0.1, specifically in the SSID Configuration component. This vulnerability resides in the function sub_44B438 within the file /cgi-bin/mbox-config?method=SET&section=ptest_ssid. By manipulating the ssid argument, an attacker can trigger a stack-based buffer overflow, potentially leading to unauthorized access or control over the device. This exploit has been made public and poses risks if not addressed promptly.

Affected Version(s)

CF-N1-S 2.6.0.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-77022 - Proof of Concept

References

https://vuldb.com/vuln/393637
vdb-entrytechnical-description
https://vuldb.com/vuln/393637/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-77022
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

010hex (VulDB User)
.