CVE-2026-9622
DoS in RSLinx Classic via crafted CIP Forward Close packet crashes service
Is CVE-2026-9622 being exploited?
Not confirmed. CVE-2026-9622 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.31% probability of exploitation in the next 30 days.
How severe is CVE-2026-9622?
CVE-2026-9622 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-9622?
Yes. A fix has been recorded for CVE-2026-9622. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-9622 affect?
CVE-2026-9622 affects Rockwell Automation RSLinx Classic, Systems using CIP / EtherNet/IP, Industrial control networks with RSLinx service. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-9622?
Apply vendor update, segment/block CIP (EtherNet/IP), monitor and restart RSLinx service as needed
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote denial-of-service: crafted CIP Forward Close packet crashes the RSLinx Classic service, interrupting controller communications and potential OT process disruption.
Patch when possible
- affectedV4.50 and prior
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.