CVE-2020-7873: Download of code without integrity check vulnerability in ActiveX control of Younglimwon Co., Ltd allows the a

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HIGH 8.8DOWNGRADE

CVE-2020-7873 is a high-severity flaw (CVSS 8.8) affecting k-system wellcomm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Download of code without integrity check vulnerability in ActiveX control of Younglimwon Co., Ltd allows the attacker to cause a arbitrary file download and execution.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-494
Published	2021-09-09
Last modified	2026-06-17

Publisher (CNA): KrCERT/CC · Vendor: ksystem

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-09 13:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

ksystem k-system wellcomm DOWNGRADE

Affected: 1.1 · 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

apt-cache policy k-system-wellcomm || rpm -q k-system-wellcomm || k-system-wellcomm --version

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison k-system-wellcomm sudo apt install k-system-wellcomm=<VERSION_BEFORE_1.1> sudo apt-mark hold k-system-wellcomm

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list k-system-wellcomm sudo dnf downgrade k-system-wellcomm-<VERSION_BEFORE_1.1> sudo dnf versionlock add k-system-wellcomm

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-7873?

k-system wellcomm: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-7873 being exploited?

CVE-2020-7873 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-7873 affect?

CVE-2020-7873 affects k-system wellcomm. Severity is high (CVSS 8.8). Download of code without integrity check vulnerability in ActiveX control of Younglimwon Co., Ltd allows the attacker to cause a arbitrary file download and execution.

How urgent is CVE-2020-7873?

Priority 43/100. High severity

References

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