CVE-2021-25665

Code execution via SCE parser out-of-bounds write

Published Sep 14, 2021 · Updated Aug 3, 2024

Out-of-bounds write in Siemens Simcenter STAR-CCM+ Viewer before 2021.2.1 allows remote attackers to execute code via a crafted SCE file. The starview+.exe SCE parser fails to validate user-supplied scene data before writing past the end of an allocated structure. Exploitation requires the target to open the malicious file or visit a page that supplies it, and successful code runs in the current process.

CVSS severity7.8
High
EPSS probability1.34%
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 Siemens Simcenter STAR-CCM+ Viewer before 2021.2.1 allows remote attackers to execute code via a crafted SCE file. The starview+.exe SCE parser fails to validate user-supplied scene data before writing past the end of an allocated structure. Exploitation requires the target to open the malicious file or visit a page that supplies it, and successful code runs in the current process.

The record

CVE
CVE-2021-25665
Published
Sep 14, 2021
Updated
Aug 3, 2024
Vendor
Siemens
Product
Simcenter STAR-CCM+ Viewer
Classifications
CWE-787, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 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=All versions < V2021.2.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Siemens · Simcenter STAR-CCM+ Viewerversion=All versions < V2021.2.1

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

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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