CVE-2021-43983: WECON LeviStudioU Versions 2019-09-21 and prior are vulnerable to multiple stack-based buffer overflow instanc

Q: How do I fix CVE-2021-43983?

levistudiou: upgrade to newer than 2019-09-21. Exact commands for each OS are on this page.

Q: Is CVE-2021-43983 being exploited?

CVE-2021-43983 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-43983 affect?

CVE-2021-43983 affects levistudiou. Severity is high (CVSS 7.8). WECON LeviStudioU Versions 2019-09-21 and prior are vulnerable to multiple stack-based buffer overflow instances while parsing project files, which may allow an attacker to execute arbitrary code.

This month

HIGH 7.8UPGRADE

CVE-2021-43983 is a high-severity flaw (CVSS 7.8) affecting levistudiou. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WECON LeviStudioU Versions 2019-09-21 and prior are vulnerable to multiple stack-based buffer overflow instances while parsing project files, which may allow an attacker to execute arbitrary code.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-121, CWE-787
Published	2021-12-13
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: we-con

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

Am I affected?

Timeline

2021-12-13 16:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

we-con levistudiou UPGRADE

Affected: <= 2019-09-21

Fixed in: newer than 2019-09-21

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy levistudiou || rpm -q levistudiou || levistudiou --version

2. UPGRADE to newer than 2019-09-21 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade levistudiou

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade levistudiou

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2021-43983?

levistudiou: upgrade to newer than 2019-09-21. Exact commands for each OS are on this page.

Is CVE-2021-43983 being exploited?

CVE-2021-43983 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-2021-43983 affect?

CVE-2021-43983 affects levistudiou. Severity is high (CVSS 7.8). WECON LeviStudioU Versions 2019-09-21 and prior are vulnerable to multiple stack-based buffer overflow instances while parsing project files, which may allow an attacker to execute arbitrary code.

How urgent is CVE-2021-43983?

Priority 49/100. High severity

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References

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