What is CVE-2021-47891?

CVE-2021-47891 is a critical-severity vulnerability in Unified Intents Ab Remote, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-01-23.

How severe is CVE-2021-47891?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Unified Intents Ab Remote

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.

Vulnerability class: Broken Authentication

EPSS: 0.008 (52.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Unified Intents Ab Remote — versions 3.9.0.2463

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2021-47891?: CVE-2021-47891 is a critical-severity vulnerability in Unified Intents Ab Remote, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-01-23.
How severe is CVE-2021-47891?: Critical severity. CVSS v3 base score is 9.8 out of 10.