CVE-2021-27494

Code execution via unchecked STP parsing

Published May 27, 2021 · Updated Aug 3, 2024

Stack-based buffer overflow in KeyShot Studio 10.1 and earlier allows local users to execute code by importing malicious STP files. The luxion_geometry.exe Datakit importer parses attacker-supplied STP data without proper validation, allowing a stack overwrite. Exploitation requires a user to open the crafted file locally and runs code in the current process context.

CVSS severity7.8
High
EPSS probability2.20%
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 KeyShot Studio 10.1 and earlier allows local users to execute code by importing malicious STP files. The luxion_geometry.exe Datakit importer parses attacker-supplied STP data without proper validation, allowing a stack overwrite. Exploitation requires a user to open the crafted file locally and runs code in the current process context.

The record

CVE
CVE-2021-27494
Published
May 27, 2021
Updated
Aug 3, 2024
Vendor
KeyShot
Product
KeyShot Studio
Classifications
CWE-121, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=CatiaV5_3dRead, CatiaV6_3dRead, Step3dRead, Ug3dReadPsr, Jt3dReadPsr modules in KeyShot Versions v10.1 and prior

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

KeyShot · KeyShot Studioversion=CatiaV5_3dRead, CatiaV6_3dRead, Step3dRead, Ug3dReadPsr, Jt3dReadPsr modules in KeyShot Versions v10.1 and prior

Published CVSS scores

7.8Luxion CSIRTCVSS:3.1/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
T1203Exploitation for Client Execution

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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