CVE-2026-51541
Out-of-bounds read in OpENer CIP parsing via forged EPath size
Is CVE-2026-51541 being exploited?
Not confirmed. CVE-2026-51541 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 0.42% probability of exploitation in the next 30 days.
How severe is CVE-2026-51541?
CVE-2026-51541 is rated Critical with a CVSS score of 9.1. 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-2026-51541?
Yes. A fix has been recorded for CVE-2026-51541. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-51541 affect?
CVE-2026-51541 affects OpENer 2.3.0 (commit 76b95cf), EtherNet/IP-enabled devices using OpENer, Industrial controllers/PLCs and embedded devices with OpENer. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-51541?
Isolate/block EtherNet/IP from untrusted networks; deploy vendor patch when available
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote unauthenticated ENIP SendRRData can trigger OOB read leading to crash (DoS) or potential memory disclosure of device data.
Patch when possible