Qihoo 360 Whole Home Router M5 Boot Script mpt start hard-coded credentials
Qihoo 360 Whole Home Router M5 devices in factory or uninitialized state, with the mptdone flag empty and LAN access open, are exposed. The checked facts list no fix.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Not reported
Do first: Workaround: The checked facts list no fix and no vendor workaround. Restricting LAN access to the device's service would remove the reachability condition, but this is not confirmed by the sources.
- Exploitation?/40Exploitation: unknown (data gap). No CISA SSVC exploitation rating yet
- Exposure17/25No login or user action needed, reachable over the network without a login · Data gap: Advisories don't say whether default setups are affected
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity10/10CVSS 10.0
- No patch5/5No patch listed yet
What would change the score
- Would score about 77 if added to CISA KEV
- Would score about 72 if CISA's SSVC rates exploitation active
- Would score about 37 if advisories confirm default setups are exposed
CVE-2026-121609 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 10.0 (critical) and affects Whole Home Router M5; no fixed version is listed yet.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.50% · 43rd percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 32/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The Qihoo 360 Whole Home Router M5 firmware contains a boot script that uses hard-coded credentials, which an attacker could potentially use to gain unauthorized remote access to the device. This could allow an attacker to take control of the router and the network it manages.
Read the original description
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.
What to do
Workaround: The checked facts list no fix and no vendor workaround. Restricting LAN access to the device's service would remove the reachability condition, but this is not confirmed by the sources.
Timeline
- CVE published
- First seen by cve.now
- Posted on X by cve.now
Affected versions
- Qihoo 360 Whole Home Router M5
4.0.17.1566
Evidence 5
- Advisory
- Advisory
- Advisory
- Advisory
- Exploit
Corrections
None so far.
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Questions about CVE-2026-121609
Is CVE-2026-121609 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
The boot script mpt start contains hard-coded credentials, so an unauthenticated attacker on the LAN can get a root shell. From there they can run arbitrary commands, read and write files, and install a persistent backdoor.Source: gist.github.com
Which versions are affected by CVE-2026-121609?
Whole Home Router M5: version 4.0.17.1566.Source: cve.now feed data
Am I affected, and how do I check?
The checked facts describe devices in factory or uninitialized state, where the mptdone hardware flag is empty, with the firewall lan zone input set to ACCEPT so the service is reachable from the LAN. No version range is listed. A reader can check the mptdone flag and the lan zone input setting on the device.Source: gist.github.com
How do I fix CVE-2026-121609?
The checked facts list no fixed version or upgrade target. Check the vendor's advisory for a firmware update that removes the hard-coded credentials.Source: gist.github.com
What if there's no patch?
The checked facts list no fix and no vendor workaround. Restricting LAN access to the device's service would remove the reachability condition, but this is not confirmed by the sources.Source: gist.github.com