CVE-2021-42544Network attack vector

Account access via unrestricted login attempts

Published Nov 30, 2021 · Updated Aug 4, 2024

Missing rate limiting in the TopEase login form through 7.1.27 allows remote attackers to make repeated authentication attempts. The login form accepts successive password submissions without restricting their frequency, enabling password guessing against a known account. Unauthenticated network access to the form is sufficient, and a successful guess grants the compromised account's privileges.

CVSS severity7.5
High
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing rate limiting in the TopEase login form through 7.1.27 allows remote attackers to make repeated authentication attempts. The login form accepts successive password submissions without restricting their frequency, enabling password guessing against a known account. Unauthenticated network access to the form is sufficient, and a successful guess grants the compromised account's privileges.

The record

CVE
CVE-2021-42544
Published
Nov 30, 2021
Updated
Aug 4, 2024
Vendor
Business-DNA Solutions GmbH
Product
TopEase
Classifications
CWE-307, CAPEC-49, T1110.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 30, 2021CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=7.1.28

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Business-DNA Solutions GmbH · TopEaseversion=unspecified <=7.1.28

Published CVSS scores

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

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
CAPEC-49Password Brute Forcing
T1110.001Brute Force: Password Guessing

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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