CVE-2021-45893Public exploitNetwork attack vector

Password guessing via uppercase password normalization

Published Apr 5, 2022 · Updated Aug 4, 2024

Improper case handling in Softwarebüro Zauner ZA|ARC 4.2.0.4 allows remote attackers to guess passwords by testing only one letter case. The application uppercases user passwords before storing them in BENUTZER.PASSWORT and applies the same conversion to login input. The behavior affects application passwords but not TMPASSWORT; unauthenticated password guessing can recover access to the matched account.

CVSS severity7.5
High
EPSS probability1.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper case handling in Softwarebüro Zauner ZA|ARC 4.2.0.4 allows remote attackers to guess passwords by testing only one letter case. The application uppercases user passwords before storing them in BENUTZER.PASSWORT and applies the same conversion to login input. The behavior affects application passwords but not TMPASSWORT; unauthenticated password guessing can recover access to the matched account.

The record

CVE
CVE-2021-45893
Published
Apr 5, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-178, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 5, 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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-178Improper Handling of Case Sensitivity
T1110Brute Force

Public exploit references

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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