CVE-2021-43394Network attack vector

Unauthenticated LDAP access via improper password validation

Published Jan 24, 2022 · Updated Aug 4, 2024

Improper authentication in Unisys OS 2200 NTSI 7R3B IC3 and IC4, 7R3C, and 7R3D allows remote attackers to pass LDAP authentication. NTSI's authentication path does not properly validate the LDAP password; Unisys has not disclosed the specific algorithm or comparison error. No prior authentication or user interaction is required, and successful authentication exposes the privileges of the presented LDAP identity.

CVSS severity9.8
Critical
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Unisys OS 2200 NTSI 7R3B IC3 and IC4, 7R3C, and 7R3D allows remote attackers to pass LDAP authentication. NTSI's authentication path does not properly validate the LDAP password; Unisys has not disclosed the specific algorithm or comparison error. No prior authentication or user interaction is required, and successful authentication exposes the privileges of the presented LDAP identity.

The record

CVE
CVE-2021-43394
Published
Jan 24, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 24, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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