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CVE-2026-9621

RSLinx Classic® - Multiple Vulnerabilities

Published: Sep 1, 2026Updated: Sep 1, 2026 Sources: CVE List NVD csafCWE-190
8.6HIGH
NVD MITRE
EPSS Score
0.3%
Top 75.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-190

Affected Products

Rockwell Automation
commercial·USaka arena®, arena simulation, armorstart st
RSLinx Classic®On-prem
ICS / OT / IoT / plc-scada-hmi

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-9621?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1794.html
rockwellautomation.com
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-244-01.json
raw.githubusercontent.com
https://www.cisa.gov/news-events/ics-advisories/icsa-26-244-01
cisa.gov
and 22 more references View all →
News mentions
1

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