What is CVE-2026-77004?

CVE-2026-77004 is a high-severity vulnerability in Comfast Cf-N1-S, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.4/10. Published 2026-08-20.

How severe is CVE-2026-77004?

High severity. CVSS v3 base score is 7.4 out of 10.

RCE in Comfast Cf-N1-S

CVE-2026-77004

A flaw has been found in Comfast CF-N1-S 2.6.0.1. This impacts the function sprintf of the file /cgi-bin/mbox-config?method=SET&section=ptest_sn. Executing a manipulation of the argument sn can lead to command injection. The attack can be launched remotely. The exploit has been published and may be used.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L.

Affected products

Comfast Cf-n1-s — versions 2.6.0.1

Weakness classification (CWE)

References

cna@vuldb.com (exploit)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)

Frequently asked questions

What is CVE-2026-77004?: CVE-2026-77004 is a high-severity vulnerability in Comfast Cf-N1-S, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.4/10. Published 2026-08-20.
How severe is CVE-2026-77004?: High severity. CVSS v3 base score is 7.4 out of 10.