CVE-2021-43394: Unisys Messaging Integration Services

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

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.

Affected products

• Unisys Messaging Integration Services: version 7r3b_ic3 only; version 7r3b_ic4 only; version 7r3c only; version 7r3d only

Published 2022-01-24. Last modified 2026-06-17.