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CVE-2026-8313 is a memory corruption vulnerability identified in Rockwell Automation’s Arena® Simulation software. The flaw resides in the `linker.exe` component, also known as Siman, which is responsible for linking simulation models and handling various data inputs during the simulation build process.
The root cause of this vulnerability is improper validation of user-supplied data. Specifically, the `linker.exe` component fails to adequately check the size and boundaries of input data before writing it to a fixed-size memory buffer. This lack of validation allows an attacker to supply a specially crafted file that, when processed by the linker, triggers an out-of-bounds write operation.
An out-of-bounds write (CWE-787) occurs when a program writes data past the end or before the beginning of the intended buffer. In the context of CVE-2026-8313, this memory corruption can be exploited to overwrite critical program data structures, including return addresses on the stack or function pointers. By carefully controlling the data written out-of-bounds, an attacker can redirect the program’s execution flow to malicious code.
To successfully exploit this vulnerability, an attacker must convince a user to open a malicious file using Arena® Simulation. The attack vector is local, meaning the attacker needs some level of access to the target system or must socially engineer the user into opening the file. The attack complexity is considered low, and the privileges required are low, making it a relatively accessible vulnerability to exploit.
The vulnerability affects Arena® Simulation versions V17.00.00 and prior. The CVSS v4.0 base score for this vulnerability is 7.0 (High), indicating a significant risk. The high score is driven by the potential for high impact on confidentiality, integrity, and availability, as successful exploitation allows an attacker to execute arbitrary code with the privileges of the current user.
As of the publication date (July 14, 2026), there are no known exploits available in the wild, and the technical details are known but no proof-of-concept exploit has been released. Rockwell Automation has released a patched version, 17.00.01, to address this issue.
DailyCVE Form:
Platform: Rockwell Automation
Version: V17.00.00 & prior
Vulnerability : Out-of-bounds write
Severity: High (CVSS 7.0)
date: 2026-07-14
Prediction: Patch available 17.00.01
What Undercode Say:
Analytics:
The vulnerability is a classic memory corruption issue in a legacy component (linker.exe) of an industrial simulation software. The attack surface is limited to local file opening, but the impact is severe (RCE). The CVSS v4.0 vector `CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N` highlights the requirement for user interaction and local access, which slightly reduces the urgency but still poses a significant risk in environments where users frequently open simulation files from untrusted sources. The availability of a patch (17.00.01) suggests that organizations should prioritize updating their Arena® Simulation installations.
Bash Commands & Codes:
To check the version of Arena® Simulation installed on a Windows system, you can use the following PowerShell command:
Get-ItemProperty "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\" | Where-Object { $_.DisplayName -like "Arena" } | Select-Object DisplayName, DisplayVersion
To verify if a system is potentially vulnerable, check if the version is `17.00.00` or earlier.
A simple Python script to test for the vulnerability (hypothetical, as no exploit is public) might involve crafting a malicious `.acf` or `.sim` file with an overly long string in a specific field to trigger the out-of-bounds write in linker.exe.
This is a conceptual example and not a working exploit.
It demonstrates how an attacker might craft a malicious file.
malicious_data = b"A" 0x1000 Excessively long data
with open("malicious_file.acf", "wb") as f:
f.write(malicious_data)
Exploit:
Currently, there are no publicly available exploits for CVE-2026-8313. The vulnerability is considered “exploitable” with low complexity, but no proof-of-concept code has been released. The exploit price is estimated to be between $0 and $5,000. Security researchers and threat actors may develop exploits in the future, but as of now, the primary risk is the potential for exploitation rather than active exploitation in the wild.
Protection:
The primary protection against CVE-2026-8313 is to update to Arena® Simulation version 17.00.01 or later. Rockwell Automation has released this patch to address the memory corruption vulnerability. If an immediate upgrade is not possible, organizations should implement the following mitigations:
Exercise Caution with Files: Users should be trained to avoid opening simulation files from untrusted or unknown sources.
Restrict Local Access: Limit local access to systems running Arena® Simulation to only authorized personnel.
Application Whitelisting: Consider using application whitelisting to prevent unauthorized executables from running.
Network Segmentation: Isolate systems running Arena® Simulation from critical network segments to limit the potential impact of a successful exploit.
Impact
Successful exploitation of CVE-2026-8313 allows an attacker to execute arbitrary code in the context of the current process. This can lead to:
System Compromise: The attacker can gain control of the affected system, potentially installing malware, stealing sensitive data, or using the system as a pivot point for further attacks.
Data Breach: The attacker could access and exfiltrate confidential information processed by Arena® Simulation or stored on the system.
Operational Disruption: In industrial environments, a compromised simulation system could be used to disrupt operations or manipulate simulation results, leading to incorrect decisions or production issues.
Privilege Escalation: While the vulnerability executes code with the user’s privileges, if the user has administrative rights, the attacker could gain full control of the system.
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Sources:
Reported By: nvd.nist.gov
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