CVE-2021-47891 Unified Remote 3.9.0.2463 - Remote Code Execution
Attackers can execute arbitrary commands by sending crafted packets to the Unified Remote service, requiring an upgrade to mitigate.
- 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-2021-47891?
CVE-2021-47891 is a critical command injection vulnerability in Unified Remote, published on 23 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Unified Remote 3.9.0.2463 contains a remote code execution vulnerability that allows attackers to send crafted network packets to execute arbitrary commands. Attackers can exploit the service by connecting to port 9512 and sending specially crafted packets to open a command prompt and download and execute malicious payloads.
Weakness: CWE-306
Which versions are affected by CVE-2021-47891?
How do I fix CVE-2021-47891?
No fix has been published for CVE-2021-47891 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-2021-47891 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47891 exists.
Sources
Also known as GHSA-g92m-pcj9-7p92.