CVE-2026-0646 | BDVDB-2026-340647 Detail

Rockwell AutomationFLEX I/O EtherNet/IP Adapters

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.

Impact#

Per CVSS v4.0: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.

Weaknesses#

CWE-401 – Missing Release of Memory after Effective Lifetime

References#

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

Exploit#

No public exploit known

History#

Version 12026-06-16Record published in the CVE List.

Published

Published: 2026-06-16
Last modified: 2026-06-16

Vendor information

Vendor: Rockwell Automation
Product: FLEX I/O EtherNet/IP Adapters

All Rockwell Automation vulnerabilities

Score

8.7 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 28.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
2.012
Fixed
Not stated

Scoring System

CVSS v4.0

8.7 High

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	None
Privileges Required	None
User Interaction	None
Vulnerable System Confidentiality	None
Vulnerable System Integrity	None
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).