PatchSiren

PatchSiren cyber security CVE debrief

CVE-2025-9465 Rockwell Automation CVE debrief

CVE-2025-9465 is a high-severity availability issue affecting Rockwell Automation ArmorStart LT products. CISA’s republication of Rockwell Automation advisory SD1768 states that, during execution of Achilles Comprehensive grammar tests, the device can reboot unexpectedly and cause the Link State Monitor to go down for several seconds. Rockwell’s guidance at the time was mitigation-focused: there was no patch or upgrade available, and users were advised to apply security best practices.

Vendor
Rockwell Automation
Product
ArmorStart LT 290D
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-29
Original CVE updated
2026-01-29
Advisory published
2026-01-29
Advisory updated
2026-01-29

Who should care

Operators and engineers responsible for Rockwell Automation ArmorStart LT 290D, 291D, and 294D deployments should treat this as an operational-availability concern. OT security teams, plant reliability staff, and incident responders should also review the advisory because the impact is a device reboot and temporary loss of Link State Monitor visibility.

Technical summary

The advisory describes a denial-of-service condition in ArmorStart LT that can be triggered in the context of Achilles Comprehensive grammar testing. The observed effect is an unexpected device reboot, with the Link State Monitor down for several seconds. The published CVSS v3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating network-reachable impact with high availability loss and no confidentiality or integrity impact stated in the source corpus.

Defensive priority

High for industrial environments where even brief device reboots or monitoring interruption can affect process visibility or availability. Priority is driven by the operational impact and the absence of a patch or upgrade in the advisory, not by any confirmed exploitation campaign in the supplied sources.

Recommended defensive actions

  • Inventory affected ArmorStart LT models: 290D, 291D, and 294D.
  • Review Rockwell Automation advisory SD1768 for the vendor’s current mitigation guidance.
  • Apply the vendor-recommended security best practices because no patch or upgrade was available at advisory time.
  • Reduce unnecessary exposure and follow ICS defense-in-depth guidance for network segmentation and access control.
  • Monitor for unexpected reboots and for Link State Monitor outages in affected environments.
  • Use the CISA ICS recommended practices and Rockwell support guidance to validate compensating controls.

Evidence notes

All material claims are taken from the supplied CISA CSAF source item and the referenced Rockwell/CISA advisory metadata. The source explicitly states that the issue can cause a denial-of-service condition, that the device may reboot unexpectedly during Achilles Comprehensive grammar tests, and that the Link State Monitor can go down for several seconds. The advisory metadata also states there was no patch or upgrade available at the time and recommends applying security best practices.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-9465 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-9465

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

  • CVE-2025-9465 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-9465

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

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-029-02.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-029-02

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

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.