Vulnerability in Qihoo 360 Whole Home Router M5
CVE-2026-121609
A vulnerability was identified in Qihoo 360 Whole Home Router M5 4.0.17.1566. This issue affects the function Home of the file /etc/init.d/mpt of the component Boot Script. The manipulation leads to hard-coded credentials. Remote exploitation of the attack is possible. The exploit is publicly available and might 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 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Qihoo 360 Whole Home Router M5 — versions 4.0.17.1566
Weakness classification (CWE)
References
- vuldb.com/vuln/430446 (technical-description, vdb-entry)
- vuldb.com/vuln/430446/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-121609 (third-party-advisory)
- vuldb.com/submit/1023264 (third-party-advisory)
- gist.github.com/gajgdm6-cpu/c8c3bbdeb51c076317834b41c3a919f2 (exploit)
Frequently asked questions
- What is CVE-2026-121609?
- CVE-2026-121609 is a critical-severity vulnerability in Qihoo 360 Whole Home Router M5, classified under Use of Hard-coded Password. CVSS score: 10.0/10. Published 2026-11-04.
- How severe is CVE-2026-121609?
- Critical severity. CVSS v3 base score is 10.0 out of 10.