CVE-2020-28599Public exploit

Code execution via excess STL vertices

Published Feb 24, 2021 · Updated Aug 4, 2024

Stack-based buffer overflow in OpenSCAD 2020.12-RC2 allows context-dependent attackers to execute code via a crafted ASCII STL file. The import_stl() parser accepts more than three vertex lines in one outer loop and uses the unchecked index to write beyond its fixed vdata[3][3] stack array. A victim must import the attacker-supplied file; successful exploitation runs code with the application's privileges, while failed attempts can crash it.

CVSS severity8.8
High
EPSS probability1.97%
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 overflow in OpenSCAD 2020.12-RC2 allows context-dependent attackers to execute code via a crafted ASCII STL file. The import_stl() parser accepts more than three vertex lines in one outer loop and uses the unchecked index to write beyond its fixed vdata[3][3] stack array. A victim must import the attacker-supplied file; successful exploitation runs code with the application's privileges, while failed attempts can crash it.

The record

CVE
CVE-2020-28599
Published
Feb 24, 2021
Updated
Aug 4, 2024
Vendor
OpenSCAD
Product
OpenSCAD
Classifications
CWE-121, CWE-787, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 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=Openscad openscad-2020.12-RC2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

OpenSCAD · OpenSCADversion=Openscad openscad-2020.12-RC2

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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 exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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