CVE-2019-17621 D-Link DIR-859 Router: 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 Jul 20, 2023
What to do
- Install D-Link's security update for DIR-859 Router. 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. This one is aimed at devices or apps of the kind people own.
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
- D-Link DIR-859 Router Command Execution Vulnerability
- Product
- D-Link DIR-859 Router
- CISA description
- D-Link DIR-859 router contains a command execution vulnerability in the UPnP endpoint URL, /gena.cgi. Exploitation allows an unauthenticated remote attacker to execute system commands as root by sending a specially crafted HTTP SUBSCRIBE request to the UPnP service when connecting to the local network.
- Type of flaw
- Command or code injection (CWE-78)
- Confirmed exploited
- Jun 29, 2023
- US federal patch deadline
- Jul 20, 2023
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Answering about CVE-2019-17621 ·
Questions about CVE-2019-17621
Is CVE-2019-17621 being exploited?
Yes. CISA added CVE-2019-17621 to its Known Exploited Vulnerabilities catalog on Jun 29, 2023, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2019-17621?
Install D-Link's security update for DIR-859 Router. 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-2019-17621?
Only if you use D-Link DIR-859 Router. This one is aimed at devices or apps of the kind people own.