CVE-2021-47667 Command injection in ZendTo
Unauthenticated attackers can execute arbitrary commands via shell metacharacters in the tmp_name parameter during file dropoff.
- 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-2021-47667?
CVE-2021-47667 is a critical command injection vulnerability in ZendTo, published on 5 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An OS command injection vulnerability in lib/NSSDropoff.php in ZendTo 5.24-3 through 6.x before 6.10-7 allows unauthenticated remote attackers to execute arbitrary commands via shell metacharacters in the tmp_name parameter when dropping off a file via a POST /dropoff request.
Weakness: CWE-78
Which versions are affected by CVE-2021-47667?
How do I fix CVE-2021-47667?
No fix has been published for CVE-2021-47667 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-2021-47667 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47667 exists.
Sources
Also known as GHSA-r4mc-p68x-wx22.