CVE-2021-42123Network attack vector

Client-side attacks via unrestricted file uploads

Published Nov 30, 2021 · Updated Aug 4, 2024

Unrestricted file upload in Business-DNA Solutions GmbH TopEase 7.1.27 and earlier allows remote authenticated users to enable client-side attacks. The File Upload functions accept files of any type without restricting dangerous formats. Upload privileges and subsequent user interaction are required, and the published impact is limited to client-side confidentiality and integrity compromise.

CVSS severity7.3
High
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Business-DNA Solutions GmbH TopEase 7.1.27 and earlier allows remote authenticated users to enable client-side attacks. The File Upload functions accept files of any type without restricting dangerous formats. Upload privileges and subsequent user interaction are required, and the published impact is limited to client-side confidentiality and integrity compromise.

The record

CVE
CVE-2021-42123
Published
Nov 30, 2021
Updated
Aug 4, 2024
Vendor
Business-DNA Solutions GmbH
Product
TopEase
Classifications
CWE-434
Attack vector
network
Privileges
authenticated

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 <=7.1.27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Business-DNA Solutions GmbH · TopEaseversion=unspecified <=7.1.27

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3NCSC.chCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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