CVE-2021-47891Public exploitNetwork attack vectorHinoki check available

Unauthenticated command execution via keyboard action packets

Published Jan 23, 2026 · Updated Jan 23, 2026

Missing authentication in Unified Remote 3.9.0.2463 allows remote attackers to execute commands through crafted packets to TCP port 9512. The server accepts unauthenticated Remote Keyboard action packets and turns their key values into host keyboard input, letting a packet sequence open cmd.exe and type commands. Network reachability to the server is required; exposure is normally local-network only unless TCP 9512 is made externally reachable.

CVSS severity9.3
Critical
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authentication in Unified Remote 3.9.0.2463 allows remote attackers to execute commands through crafted packets to TCP port 9512. The server accepts unauthenticated Remote Keyboard action packets and turns their key values into host keyboard input, letting a packet sequence open cmd.exe and type commands. Network reachability to the server is required; exposure is normally local-network only unless TCP 9512 is made externally reachable.

The record

CVE
CVE-2021-47891
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
Unified Intents AB
Product
Unified Remote
Classifications
CWE-306, T1059.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.9.0.2463

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Unified Intents AB · Unified Remoteversion=3.9.0.2463

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1059.003Command and Scripting Interpreter: Windows Command Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo