How severe is CVE-2026-0646?

CVE-2026-0646 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2026-0646 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-0646?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-0646 have an EU (EUVD) identifier?

Yes. CVE-2026-0646 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37121.

When was CVE-2026-0646 published?

CVE-2026-0646 was published on 2026-06-16 and last updated on 2026-06-17.

CVE-2026-0646

CVE-2026-0646 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-401.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37121
Weakness: CWE-401
Published: 2026-06-16
Last modified: 2026-06-17

Description

A denial-of-service security issue exists within the 1794-AENTR adapter due to improper memory handling of CIP protocol requests. This vulnerability can result in the adapter faulting and losing connection to its associated I/O modules, requiring a manual reset to recover.

Frequently asked questions

What is CVE-2026-0646?: A denial-of-service security issue exists within the 1794-AENTR adapter due to improper memory handling of CIP protocol requests. This vulnerability can result in the adapter faulting and losing connection to its associated I/O modules, requiring a manual reset to recover.
How severe is CVE-2026-0646?: CVE-2026-0646 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2026-0646 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-0646?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-0646 have an EU (EUVD) identifier?: Yes. CVE-2026-0646 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37121.
When was CVE-2026-0646 published?: CVE-2026-0646 was published on 2026-06-16 and last updated on 2026-06-17.

References

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1775.html

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