What is CVE-2021-43394?

CVE-2021-43394 is a critical-severity vulnerability in Unisys Clearpath 2200, classified under Improper Authentication. CVSS score: 9.8/10. Published 2022-01-24.

How severe is CVE-2021-43394?

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

Auth bypass in Unisys Clearpath 2200

CVE-2021-43394

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.

Vulnerability class: Broken Authentication

Published 2022-01-24 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.012 (66.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Unisys Clearpath 2200
Unisys Messaging Integration Services — versions 7r3b_ic3, 7r3b_ic4, 7r3c

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

public.support.unisys.com/common/public/vulnerability/NVD_Detail_Rpt.aspx (Vendor Advisory)

Frequently asked questions

What is CVE-2021-43394?: CVE-2021-43394 is a critical-severity vulnerability in Unisys Clearpath 2200, classified under Improper Authentication. CVSS score: 9.8/10. Published 2022-01-24.
How severe is CVE-2021-43394?: Critical severity. CVSS v3 base score is 9.8 out of 10.