CVE-2024-21920

User-assisted disclosure and crash via out-of-bounds read

Published Mar 26, 2024 · Updated Aug 6, 2024

Out-of-bounds read in Rockwell Automation Arena Simulation 16.00 through 16.20.02 allows attackers to disclose data or crash via a malicious file. A Microsoft dynamic-link library reads past intended memory boundaries while processing the crafted file; Rockwell has not disclosed the library or parser entry point. Exploitation requires a user to open the file and is limited to information disclosure and an application crash, with no reported integrity impact.

CVSS severity4.4
Medium
EPSS probability0.22%
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 read in Rockwell Automation Arena Simulation 16.00 through 16.20.02 allows attackers to disclose data or crash via a malicious file. A Microsoft dynamic-link library reads past intended memory boundaries while processing the crafted file; Rockwell has not disclosed the library or parser entry point. Exploitation requires a user to open the file and is limited to information disclosure and an application crash, with no reported integrity impact.

The record

CVE
CVE-2024-21920
Published
Mar 26, 2024
Updated
Aug 6, 2024
Vendor
Rockwell Automation
Product
Arena Simulation
Classifications
CWE-125, CAPEC-100, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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=Version 16.00 - 16.20.02

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Rockwell Automation · Arena Simulationversion=Version 16.00 - 16.20.02

Published CVSS scores

4.4Rockwell AutomationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
7.1NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/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-125Out-of-bounds Read
CAPEC-100Overflow Buffers
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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