CVE-2020-28600Public exploit

Code execution via malformed STL vertex parsing

Published May 10, 2021 · Updated Aug 4, 2024

Out-of-bounds write in OpenSCAD 2020.12-RC2 allows attackers to execute code when a crafted ASCII STL file is imported. In import_stl(), a failed vertex-number conversion sets the row index to 10, after which the next vertex writes attacker-controlled values beyond the three-row vdata stack array. Exploitation requires a user to import the malicious file; the overwrite can corrupt a shared-pointer control value and redirect execution during destruction.

CVSS severity8.8
High
EPSS probability1.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in OpenSCAD 2020.12-RC2 allows attackers to execute code when a crafted ASCII STL file is imported. In import_stl(), a failed vertex-number conversion sets the row index to 10, after which the next vertex writes attacker-controlled values beyond the three-row vdata stack array. Exploitation requires a user to import the malicious file; the overwrite can corrupt a shared-pointer control value and redirect execution during destruction.

The record

CVE
CVE-2020-28600
Published
May 10, 2021
Updated
Aug 4, 2024
Vendor
OpenSCAD
Product
OpenSCAD
Classifications
CWE-119, CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 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
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8Cisco TalosCVSS:3.0/AV:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787Out-of-bounds Write
T1204.002User Execution: Malicious 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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