CVE-2026-12659
CIP packet handling flaw causes device DoS requiring power cycle and I/O outage.
Is CVE-2026-12659 being exploited?
Not confirmed. CVE-2026-12659 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 0.43% probability of exploitation in the next 30 days.
How severe is CVE-2026-12659?
CVE-2026-12659 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-2026-12659?
Yes. A fix has been recorded for CVE-2026-12659. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-12659 affect?
CVE-2026-12659 affects Devices using CIP/EtherNet-IP adapters, Industrial I/O modules, PLCs and OT gateways that process CIP packets. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-12659?
Isolate affected devices, block/inspect CIP traffic, contact vendor for patches.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crafted CIP packets can remotely crash adapters/modules, causing device denial-of-service and loss of I/O until power-cycled.
Immediate action required
- affectedversion 6.011
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.