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Vulnerability record · CVE-2021-47891 · published 23 January 2026

CVE-2021-47891: Missing authentication for critical function vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.93% · top 41.1% CWE-306 · Missing authentication for critical function Deferred
9.3CVSS 4.0 base score
0.93%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS: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:

References

LinkTags
https://www.exploit-db.com/exploits/49587
https://www.unifiedremote.com/
https://www.unifiedremote.com/download
https://www.vulncheck.com/advisories/unified-remote-remote-code-execution

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Source: NIST National Vulnerability Database (record CVE-2021-47891), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.