RCE in Comfast Cf-N1-S
CVE-2026-19976
A security vulnerability has been detected in COMFAST CF-N1-S 2.6.0.1. Impacted is the function sub_44A968 of the file /cgi-bin/mbox-config?method=SET§ion=ptest_macaddress. Such manipulation of the argument macaddress leads to command injection. The attack may be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.029 (86.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.029 · change: +0.008
Affected products
- Comfast Cf-N1-S — versions 2.6.0.1
Weakness classification (CWE)
References
- vuldb.com/vuln/391155 (technical-description, vdb-entry)
- vuldb.com/vuln/391155/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-19976 (third-party-advisory)
- vuldb.com/submit/873821 (third-party-advisory)
- github.com/1ChaoRen1/IOT/blob/main/CF-N1-S-V2.6.0.1 .pdf (exploit)
Frequently asked questions
- What is CVE-2026-19976?
- CVE-2026-19976 is a medium-severity vulnerability in Comfast Cf-N1-S, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.6/10. Published 2026-08-17.
- How severe is CVE-2026-19976?
- Medium severity. CVSS v3 base score is 6.6 out of 10.