CVE-2024-11667 Zyxel Multiple Firewalls: file path flaw
In plain words: The program can be tricked into reading or writing files outside the folder it should stay in. Leaks files such as passwords and settings, or overwrites important ones.
Confirmed exploited by CISA on · US federal patch deadline Dec 24, 2024
What to do
- Install Zyxel's security update for Multiple Firewalls. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Patch edge devices first — attackers often start scanning for them within hours of a fix.
- Never expose the device's admin page to the internet.
- After patching a device that was exposed, follow the vendor's compromise checks, end active sessions and change passwords.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: They face the internet and guard the whole network, so a flaw here can hand attackers a way in — and these devices usually run no antivirus, so break-ins go unnoticed.
The details
- Official name
- Zyxel Multiple Firewalls Path Traversal Vulnerability
- Product
- Zyxel Multiple Firewalls
- CISA description
- Multiple Zyxel firewalls contain a path traversal vulnerability in the web management interface that could allow an attacker to download or upload files via a crafted URL.
- Type of flaw
- File path flaw (CWE-22)
- Confirmed exploited
- Dec 3, 2024 — known to be used in ransomware attacks
- US federal patch deadline
- Dec 24, 2024
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Answering about CVE-2024-11667 ·
Questions about CVE-2024-11667
Is CVE-2024-11667 being exploited?
Yes. CISA added CVE-2024-11667 to its Known Exploited Vulnerabilities catalog on Dec 3, 2024, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2024-11667?
Install Zyxel's security update for Multiple Firewalls. If no update exists, follow the vendor's workaround or stop using the product until one ships. Patch edge devices first — attackers often start scanning for them within hours of a fix.
Am I affected by CVE-2024-11667?
Only if you use Zyxel Multiple Firewalls. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.