CVE-2026-84235
Crafted CIP packet crashes Rockwell module (Denial of Service), requires restart.
Is CVE-2026-84235 being exploited?
Not confirmed. CVE-2026-84235 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-2026-84235?
CVE-2026-84235 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-2026-84235?
Yes. A fix has been recorded for CVE-2026-84235. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-84235 affect?
CVE-2026-84235 affects Rockwell Automation CIP-enabled devices/modules, EtherNet/IP/CIP modules. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-84235?
Apply vendor firmware updates and block untrusted CIP traffic at network edges.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote denial-of-service: a crafted CIP packet crashes affected module, forcing device restart and disrupting control/automation operations.
Patch when possible
- affectedAll versions
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.