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CVE-2026-9621— RSLinx Classic® - Multiple Vulnerabilities

Quick assessment

Affected
Rockwell Automation RSLinx Classic®
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rockwell Automation RSLinx Classic®是美国Rockwell Automation基金会的一款工业自动化通信软件。 Rockwell Automation RSLinx Classic V4.50及之前版本存在数字错误漏洞，该漏洞源于对畸形数据包处理不当，特制的CIP数据包可能导致服务崩溃，需要重启服务才能恢复。

CVSS 9.2 · Critical EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
Rockwell Automation RSLinx Classic® V4.50 and prior affected
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I. Basic Information for CVE-2026-9621

Vulnerability Information
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Vulnerability Title
RSLinx Classic® - Multiple Vulnerabilities
Source: CVE Program / CVE List V5
Vulnerability Description
A denial-of-service security issue exists within RSLinx® Classic. The security issue stems from improper handling of a malformed packet. A crafted CIP packet can cause the RSLinx® Classic service to crash, requiring a restart of the service to recover
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
Rockwell Automation RSLinx Classic 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rockwell Automation RSLinx Classic®是美国Rockwell Automation基金会的一款工业自动化通信软件。 Rockwell Automation RSLinx Classic V4.50及之前版本存在数字错误漏洞，该漏洞源于对畸形数据包处理不当，特制的CIP数据包可能导致服务崩溃，需要重启服务才能恢复。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Rockwell Automation RSLinx Classic® V4.50 and prior -

II. Public POCs for CVE-2026-9621

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III. Intelligence Information for CVE-2026-9621

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Vendor Advisories for CVE-2026-9621 (1)

Same Patch Batch · Rockwell Automation · 2026-09-01 · 16 CVEs total

CVE-2026-19472 8.7 HIGH Rockwell Automation ArmorStart® LT Denial Of Service
CVE-2026-84235 8.7 HIGH Rockwell Automation 1756-ENBT Denial of Service Vulnerability
CVE-2026-9637 8.7 HIGH CompactLogix® 5380 / ControlLogix® 5580 - Multiple Vulnerabilities
CVE-2026-9622 8.7 HIGH RSLinx Classic® - Multiple Vulnerabilities
CVE-2026-9625 8.7 HIGH RSLinx Classic® - Multiple Vulnerabilities
CVE-2026-9624 8.7 HIGH RSLinx Classic® - Multiple Vulnerabilities
CVE-2024-7952 8.7 HIGH DataEdgePlatform DataMosaix™ Private Cloud
CVE-2024-7953 8.7 HIGH DataEdgePlatform DataMosaix™ Private Cloud
CVE-2025-12768 8.6 HIGH FactoryTalk® Historian Machine Edition - Out-of-Bounds Write Vulnerability
CVE-2026-16675 8.5 HIGH Rockwell Automation FactoryTalk® Activation Manager - Privilege Escalation
CVE-2026-12663 7.0 HIGH ControlFLASH ® – Improper Access Control
CVE-2026-9633 7.0 HIGH Redundancy Module Configuration Tool - Multiple Vulnerabilities
CVE-2026-9634 7.0 HIGH Redundancy Module Configuration Tool - Multiple Vulnerabilities
CVE-2026-19471 6.9 MEDIUM Rockwell Automation ArmorStart® LT Stored Cross-site scripting
CVE-2026-12661 4.8 MEDIUM FactoryTalk® Historian Machine Edition - Out-of-Bounds Write Vulnerability

IV. Related Vulnerabilities

Same product: RSLinx Classic®
Same vendor: Rockwell Automation
Same weakness: CWE-190

V. Comments for CVE-2026-9621

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