CVE-2026-8314

Code execution via malformed file out-of-bounds write

Published Jul 14, 2026 · Updated Jul 14, 2026

Out-of-bounds write in siman.exe in Rockwell Automation Arena Simulation 17.00.00 and earlier allows local users to execute code. The Siman component fails to validate data from an opened file before writing beyond the intended memory boundary. Exploitation requires a local user to open a crafted file, after which code runs with the privileges of the Arena process.

CVSS severity7.0
High
EPSS probability0.23%
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 siman.exe in Rockwell Automation Arena Simulation 17.00.00 and earlier allows local users to execute code. The Siman component fails to validate data from an opened file before writing beyond the intended memory boundary. Exploitation requires a local user to open a crafted file, after which code runs with the privileges of the Arena process.

The record

CVE
CVE-2026-8314
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Rockwell Automation
Product
Arena Simulation
Classifications
CWE-787, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record 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=V17.00.00 and prior

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Rockwell Automation · Arena Simulationversion=V17.00.00 and prior

Published CVSS scores

7.0Rockwell AutomationCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8Rockwell AutomationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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