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§ion=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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.018 (77.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.018 · change: +0.005
Affected products
- Comfast Cf-N1-S — versions 2.6.0.1
Weakness classification (CWE)
References
- github.com/lxiansheng488-bit/-/blob/main/厂商comefast CF-N1-S V2.pdf (exploit)
- vuldb.com/cve/CVE-2026-77004 (third-party-advisory)
- vuldb.com/submit/880584 (third-party-advisory)
- vuldb.com/vuln/393623 (technical-description, vdb-entry)
- vuldb.com/vuln/393623/cti (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.