CVE-2021-43983 | WECON LeviStudioU

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.

Published: 2021-12-13 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-43983 is rated Moderate Risk (53.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.48%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-43983

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.69% 0.48% -0.20%
2 2025-11-18 0.46% 0.69% +0.23%
3 2025-03-30 — 0.46% —

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-43983

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2021-43983

Affected software / configurations for CVE-2021-43983

Vendor Product Version Raw CPE
we-con levistudiou <= 2019-09-21 cpe:2.3:a:we-con:levistudiou:*:*:*:*:*:*:*:*

References for CVE-2021-43983

URL Tags
https://www.cisa.gov/uscert/ics/advisories/icsa-21-343-02 Third Party Advisory US Government Resource
https://www.zerodayinitiative.com/advisories/ZDI-22-034/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-035/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-036/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-037/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-038/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-039/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-040/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-041/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-042/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-043/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-044/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-045/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-046/ Third Party Advisory VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-047/ Third Party Advisory VDB Entry
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