Is CVE-2021-43394 actively exploited?

No active exploitation of CVE-2021-43394 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-43394 be exploited remotely?

Yes. CVE-2021-43394 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-43394?

CVE-2021-43394 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-43394

CRITICAL

CVE-2021-43394

CWE-287Published: January 24, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Unisys OS 2200 Messaging Integration Services (NTSI) 7R3B IC3 and IC4, 7R3C, and 7R3D has an Incorrect Implementation of an Authentication Algorithm. An LDAP password is not properly validated.

NVD Source

Technical Analysis

CVE-2021-43394 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.