CVE-2026-71921 DrayTek VigorSwitch Multiple Models Pre-Authentication OS Command Injection via setget.cgi
Remote attackers can execute arbitrary commands with root privileges on DrayTek VigorSwitch models via pre-authentication input in setget.cgi.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-71921?
CVE-2026-71921 is a critical command injection vulnerability in DrayTek Corporation VigorSwitch FX2120, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Multiple DrayTek VigorSwitch models contain a pre-authentication command injection vulnerability in the setget.cgi interface. The vulnerability is caused by insufficient filtering of the pass field before command execution. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges.
Weakness: CWE-78
Which versions are affected by CVE-2026-71921?
How do I fix CVE-2026-71921?
No fix has been published for CVE-2026-71921 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-71921 being exploited?
There is no known exploitation of CVE-2026-71921 in the wild and no public exploit code.
Sources
Also known as GHSA-c34j-h938-5r57.