Cyber Resilience

CVE-2026-2535

Command Injection in Comfast Cf-N1 Firmware 2.6.0.2

Public PoCCommand Injection
Published
16 February 2026
Modified
19 February 2026
CVSS Score v4 5.3
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/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
EPSS Score 0.14 96th percentile
Risk Priority 45 floored blend · peak EPSS

Summary

CVE-2026-2535 is a medium-severity Injection (CWE-74) vulnerability in Comfast Cf-N1 Firmware. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Command and Scripting Interpreter (T1059); ranked in the top 4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2026-2535 is a command injection vulnerability affecting the Comfast CF-N1 V2 router running firmware version 2.6.0.2. The issue resides in the sub_44AB9C function within the /cgi-bin/mbox-config?method=SET&section=ptest_channel endpoint, where manipulation of the 'channel' argument enables arbitrary command execution. This flaw is classified under CWE-74 (Improper Neutralization of Special Elements used in an SQL Command) and CWE-77 (Command Injection), with a CVSS v3.1 base score of 6.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L).

The vulnerability can be exploited remotely by attackers who possess low privileges, such as authenticated users on the device. Successful exploitation allows limited impacts on confidentiality, integrity, and availability, potentially enabling command execution within the context of the affected component. No user interaction is required, and the low attack complexity makes it accessible over the network.

Advisories from VulDB and a public GitHub repository detail the vulnerability, including a proof-of-concept exploit. The vendor was notified early but provided no response or patch, leaving affected devices without official mitigation. Security practitioners should consider network segmentation, disabling the affected endpoint if possible, or upgrading firmware if updates become available.

The exploit has been publicly disclosed and could be actively used in the wild, increasing the risk for exposed Comfast CF-N1 V2 devices.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

A vulnerability was found in Comfast CF-N1 V2 2.6.0.2. The impacted element is the function sub_44AB9C of the file /cgi-bin/mbox-config?method=SET&section=ptest_channel. The manipulation of the argument channel results in command injection. The attack can be launched remotely. The exploit has been…

more

made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

CWE(s)
CWE-74CWE-77

Related Threats

MITRE ATT&CK Enterprise Techniques

T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1221 Template Injection Stealth
Adversaries may create or modify references in user document templates to conceal malicious code or force authentication attempts.
attack.mitre.org →
T1659 Content Injection Initial Access
Adversaries may gain access and continuously communicate with victims by injecting malicious content into systems through online network traffic.
attack.mitre.org →
T1674 Input Injection Execution
Adversaries may simulate keystrokes on a victim’s computer by various means to perform any type of action on behalf of the user, such as launching the command interpreter using keyboard shortcuts, typing an inline script to be executed,…
attack.mitre.org →
T1059.001 PowerShell Execution
Adversaries may abuse PowerShell commands and scripts for execution.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-9585Same product: Comfast Cf-N1
CVE-2026-2534Same product: Comfast Cf-N1
CVE-2025-9582Same product: Comfast Cf-N1
CVE-2025-9586Same product: Comfast Cf-N1
CVE-2025-9583Same product: Comfast Cf-N1
CVE-2025-9581Same product: Comfast Cf-N1
CVE-2025-9584Same product: Comfast Cf-N1
CVE-2026-2824Same vendor: Comfast
CVE-2026-3798Same vendor: Comfast
CVE-2026-2537Same vendor: Comfast

Affected Assets

comfast
cf-n1 firmware
2.6.0.2

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.2.1
  • V1.2.3
  • V1.2.5
  • V1.2.8

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation can discover command-construction flaws before deployment.

SI-10 Information Input Validation good match

SI-10 directly requires validation of information inputs to reject malformed or special-element content before it reaches downstream parsers.

SA-8 Security and Privacy Engineering Principles partial match

Secure engineering principles include proper neutralization and safe command construction practices.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and output encoding that prevent injection flaws.

DE.CM-09 partial match
prevents

Runtime monitoring of software and data can detect anomalous command execution resulting from injection.

ID.RA-01 partial match
prevents

Identifying recorded vulnerabilities enables remediation of command-injection flaws before exploitation.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.28 Secure coding mostly match
prevents

Secure coding standards require proper escaping and parameterization of commands, directly eliminating CWE-77.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development catches injection vulnerabilities before release.

A.8.15 Logging partial match
finds

Logging supports detection of injection attempts but does not prevent the weakness.

A.8.16 Monitoring activities partial match
finds

Monitoring activities can identify active injection attacks after they occur.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates input validation and output encoding that directly prevent injection flaws.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for controls against injection attacks in software design.

References