CVE-2017-6884 Zyxel EMG2926 Routers: command or code injection
In plain words: The program treats text it receives as instructions instead of plain data. The attacker can run commands on the machine — often the whole device is taken over.
Confirmed exploited by CISA on · US federal patch deadline Oct 9, 2023
What to do
- Install Zyxel's security update for EMG2926 Routers. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Turn on automatic firmware updates and replace gear the maker no longer supports.
- Change default passwords and switch off remote administration and features you do not use.
- Do not put storage boxes or cameras directly on the internet — use the maker's app or a VPN.
Who is affected
Could reach you. Used in ransomware, which spreads to ordinary people and small businesses.
What's at risk: Taken over in bulk to join botnets, used to watch your traffic, or — for storage boxes — locked by ransomware.
The details
- Official name
- Zyxel EMG2926 Routers Command Injection Vulnerability
- Product
- Zyxel EMG2926 Routers
- CISA description
- Zyxel EMG2926 routers contain a command injection vulnerability located in the diagnostic tools, specifically the nslookup function. A malicious user may exploit numerous vectors to execute malicious commands on the router, such as the ping_ip parameter to the expert/maintenance/diagnostic/nslookup URI.
- Type of flaw
- Command or code injection (CWE-78)
- Confirmed exploited
- Sep 18, 2023 — known to be used in ransomware attacks
- US federal patch deadline
- Oct 9, 2023
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Answering about CVE-2017-6884 ·
Questions about CVE-2017-6884
Is CVE-2017-6884 being exploited?
Yes. CISA added CVE-2017-6884 to its Known Exploited Vulnerabilities catalog on Sep 18, 2023, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2017-6884?
Install Zyxel's security update for EMG2926 Routers. If no update exists, follow the vendor's workaround or stop using the product until one ships. Turn on automatic firmware updates and replace gear the maker no longer supports.
Am I affected by CVE-2017-6884?
Only if you use Zyxel EMG2926 Routers. Used in ransomware, which spreads to ordinary people and small businesses.