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PatchSiren cyber security CVE debrief

CVE-2026-9307 Rockwell Automation CVE debrief

A sensitive information disclosure security issue exists within the affected CompactLogix controllers. The controller's web server exposes CIP Connection IDs on the diagnostics webpage, which are accessible to any unauthenticated user on the network. This information can be leveraged by an attacker to construct malicious packets, leading to Denial-of-Service.

Vendor
Rockwell Automation
Product
CompactLogix 5370
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-06-16
Advisory published
2026-06-16
Advisory updated
2026-06-16

Who should care

Administrators and users of CompactLogix controllers should be aware of this vulnerability and take necessary actions to mitigate the risk.

Technical summary

The affected CompactLogix controllers' web server exposes CIP Connection IDs on the diagnostics webpage without requiring authentication. This allows an attacker to access sensitive information and potentially construct malicious packets to cause a Denial-of-Service.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update the affected CompactLogix controllers with the latest security patches.
  • Restrict access to the diagnostics webpage to authenticated users only.
  • Monitor network traffic for suspicious activity.

Evidence notes

The CVE record and NVD detail pages provide information on the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-9307 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-9307

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-9307 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-9307

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.