CVE-2021-47891

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.

CVSS v4.0

9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.83% chance of exploitation in the next 30 days, 55th percentile

Published

2026-01-23

Updated

2026-04-07

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/49587

References

• CVE Record
• NVD entry

Related

• CVE-2021-47890
• CVE-2021-47892
• CVE-2021-47889
• CVE-2021-47893
• CVE-2021-47888
• CVE-2021-47894