CVE-2025-21166

Code execution via out-of-bounds file parsing

Published Jul 8, 2025 · Updated Jul 8, 2025

Out-of-bounds write in Adobe Substance 3D Designer 14.1 and earlier allows local users to execute code by opening a malicious file. Adobe identifies malicious-file handling as the trigger but does not disclose the affected parser, file format, or faulty write operation. Exploitation requires a user to open the file, after which code runs with that user's privileges and can affect data or interrupt the application.

CVSS severity7.8
High
EPSS probability0.19%
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 Adobe Substance 3D Designer 14.1 and earlier allows local users to execute code by opening a malicious file. Adobe identifies malicious-file handling as the trigger but does not disclose the affected parser, file format, or faulty write operation. Exploitation requires a user to open the file, after which code runs with that user's privileges and can affect data or interrupt the application.

The record

CVE
CVE-2025-21166
Published
Jul 8, 2025
Updated
Jul 8, 2025
Vendor
Adobe
Product
Substance 3D Designer
Classifications
CWE-787, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2025Record 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=0 <=14.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Adobe · Substance 3D Designerversion=0 <=14.1

Published CVSS scores

7.8AdobeCVSS: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-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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