CVE-2020-16243

Code execution via unchecked project-file lengths

Published Feb 23, 2021 · Updated Aug 4, 2024

Stack-based buffer overflows in WECON LEVIStudioU 2019-09-21 and earlier allow attackers to execute code via crafted project files. The HFT and HSC parsers copy unchecked user-supplied lengths, including the HSC CharSize attribute, into fixed-length stack buffers. Execution requires a user to open a malicious file or visit a malicious page and runs with the application's privileges.

CVSS severity7.8
High
EPSS probability12.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflows in WECON LEVIStudioU 2019-09-21 and earlier allow attackers to execute code via crafted project files. The HFT and HSC parsers copy unchecked user-supplied lengths, including the HSC CharSize attribute, into fixed-length stack buffers. Execution requires a user to open a malicious file or visit a malicious page and runs with the application's privileges.

The record

CVE
CVE-2020-16243
Published
Feb 23, 2021
Updated
Aug 4, 2024
Vendor
WECON Technology Co., Ltd.
Product
LEVIStudioU
Classifications
CWE-121, CWE-787, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 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=Version 2019-09-21 and prior

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

WECON Technology Co., Ltd. · LEVIStudioUversion=Version 2019-09-21 and prior

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8CISA ICS-CERTCVSS:3.0/AV:L/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.

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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