CVE-2020-7873Network attack vector

Arbitrary file execution via unchecked ActiveX download

Published Sep 9, 2021 · Updated Aug 4, 2024

Code-download integrity failure in Younglimwon SoftLab K-System WellComm 1.1 and 4.0 allows remote attackers to execute files via ActiveX. The ActiveX control downloads and runs code without verifying the downloaded file's origin or integrity. The CNA assessment requires user interaction, and successful exploitation permits arbitrary file execution on the Windows host.

CVSS severity8.8
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code-download integrity failure in Younglimwon SoftLab K-System WellComm 1.1 and 4.0 allows remote attackers to execute files via ActiveX. The ActiveX control downloads and runs code without verifying the downloaded file's origin or integrity. The CNA assessment requires user interaction, and successful exploitation permits arbitrary file execution on the Windows host.

The record

CVE
CVE-2020-7873
Published
Sep 9, 2021
Updated
Aug 4, 2024
Vendor
Younglimwon SoftLab Co., Ltd.
Product
K-System WellComm
Classifications
CWE-494, T1105
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 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=1.1, 4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Younglimwon SoftLab Co., Ltd. · K-System WellCommversion=1.1, 4.0

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8KrCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

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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-494Download of Code Without Integrity Check
T1105Ingress Tool Transfer

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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