CVE-2026-0647Network attack vector

Unauthenticated account takeover via password-change endpoint

Published Jun 16, 2026 · Updated Jun 16, 2026

Improper authentication in Rockwell Automation FLEX I/O adapters 2.012 allows remote attackers to change the web password via HTTP. The embedded web server's password-change endpoint processes a crafted GET request without verifying a session or prior authentication. Network access to the enabled web server is sufficient, enabling account takeover and interruption of the device web interface.

CVSS severity9.4
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Rockwell Automation FLEX I/O adapters 2.012 allows remote attackers to change the web password via HTTP. The embedded web server's password-change endpoint processes a crafted GET request without verifying a session or prior authentication. Network access to the enabled web server is sufficient, enabling account takeover and interruption of the device web interface.

The record

CVE
CVE-2026-0647
Published
Jun 16, 2026
Updated
Jun 16, 2026
Vendor
Rockwell Automation
Product
FLEX I/O Dual Port EtherNet/IP Adapters
Classifications
CWE-306, T0892
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=2.012

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rockwell Automation · FLEX I/O Dual Port EtherNet/IP Adaptersversion=2.012

Published CVSS scores

8.8Rockwell AutomationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N
9.4Rockwell AutomationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T0892Change Credential

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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