CVE-2021-43394

Name: CVE-2021-43394
Creator: NVD / NIST
Published: 2022-01-24T22:15:07.763+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.17%

Last modified Jun 17, 2026

CVE-2021-43394 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.17% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.17%

63.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Unisys	Messaging Integration Services	7r3b_ic3
Unisys	Messaging Integration Services	7r3b_ic4
Unisys	Messaging Integration Services	7r3c
Unisys	Messaging Integration Services	7r3d

References

https://public.support.unisys.com/common/public/vulnerability/NVD_Detail_Rpt.aspx?ID=66Vendor Advisory
https://public.support.unisys.com/common/public/vulnerability/NVD_Detail_Rpt.aspx?ID=66Vendor Advisory

Timeline

Published: Jan 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is 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.

How severe is CVE-2021-43394?

CVE-2021-43394 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.17% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43394?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43394?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST