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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.

RSLinx® Classic 存在一个拒绝服务（Denial-of-Service, DoS）安全漏洞。该问题的根源在于对格式错误（malformed）数据包的异常处理不当。攻击者可以构造一个特制的 CIP 数据包，导致 RSLinx® Classic 服务崩溃，必须重启该服务才能恢复正常运行。

CVSS 9.2 · Critical

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood
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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

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 · 14 CVEs total

CVE-2026-9625 8.7 HIGH RSLinx Classic® - Multiple Vulnerabilities
CVE-2026-9624 8.7 HIGH RSLinx Classic® - Multiple Vulnerabilities
CVE-2026-9622 8.7 HIGH RSLinx Classic® - Multiple Vulnerabilities
CVE-2026-9637 8.7 HIGH CompactLogix® 5380 / ControlLogix® 5580 - Multiple Vulnerabilities
CVE-2026-84235 8.7 HIGH Rockwell Automation 1756-ENBT Denial of Service Vulnerability
CVE-2026-19472 8.7 HIGH Rockwell Automation ArmorStart® LT Denial Of Service
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-2026-9634 7.0 HIGH Redundancy Module Configuration Tool - Multiple Vulnerabilities
CVE-2026-9633 7.0 HIGH Redundancy Module Configuration Tool - Multiple Vulnerabilities
CVE-2026-12663 7.0 HIGH ControlFLASH ® – Improper Access Control
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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