CVE-2026-75364 Comfast CVE debrief

Who should care

System administrators and security teams responsible for Comfast CF-N1-S and CF-WR630AX devices, as well as organizations using these devices in their network infrastructure, should review and apply firmware updates, implement input validation and sanitization, and monitor system logs for suspicious activity.

Technical summary

The update_interface_png SET handler in /usr/bin/webmgnt fails to sanitize the display_name parameter, allowing user-controlled input to be concatenated via sprintf() into an unquoted shell command. This command is executed by system() with root privileges, enabling a remote authenticated attacker to inject arbitrary commands. The vulnerability affects Comfast CF-N1-S firmware 2.6.0.1 and CF-WR630AX (2024-01-30 build).

Defensive priority

Medium priority due to the CVSS score of 6.8 and the potential for command injection.

Recommended defensive actions

• Review and apply firmware updates for Comfast CF-N1-S and CF-WR630AX devices.
• Implement input validation and sanitization for the display_name parameter.
• Monitor system logs for suspicious activity related to the /usr/bin/webmgnt process.
• Restrict access to the web management interface to trusted users only.
• Consider replacing affected devices with ones that have a more robust security track record.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and vector. However, additional information about the affected products and vendor response is limited. Further review of the official advisory and source references is recommended to understand the full scope of the vulnerability and potential impact. Affected product deployments should be identified and owners assigned for follow-up. Compensating controls may be necessary while remediation is scheduled and verified.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.