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CVE-2026-19472 – Denial of Service via Crafted HTTP PUT – Rockwell Automation ArmorStart LT (≤ v2.00

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Summary

CVE-2026-19472 is a denial-of-service vulnerability affecting Rockwell Automation ArmorStart® LT smart motor controllers (catalog numbers Bul 290E, 291E, and 294E). The flaw stems from improper handling of a crafted HTTP PUT request sent to the device’s embedded web server, allowing an unauthenticated network attacker to disrupt availability. The vulnerability carries a CVSS v4.0 base score of 8.7 (High) and a CVSS v3.1 score of 7.5.

Technical details

  • Root cause: The embedded web server on ArmorStart LT improperly handles a specially crafted HTTP PUT request, consistent with CWE-770 (Allocation of Resources Without Limits or Throttling).
  • Trigger conditions: An attacker sends a malformed/crafted HTTP PUT request to the device’s embedded web management interface over the network.
  • Attack vector: Network-based; the CVSS v4.0 vector (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) indicates low attack complexity, no privileges required, and no user interaction needed.
  • Impact: Successful exploitation results in loss of availability of the affected device — the web server and/or device functionality can become unresponsive, disrupting monitoring and control operations. No confidentiality or integrity impact is indicated.
  • Discovery: Identified internally by Rockwell Automation; there are no known public reports of active exploitation of this CVE.

Affected software

  • Rockwell Automation ArmorStart® LT (catalog numbers Bul 290E, 291E, and 294E) — firmware versions v2.001 and below

Severity

  • CVSS v3.1 Base Score: 7.5 (High)
  • CVSS v4.0 Base Score: 8.7 (High)
  • CVSS v4.0 Vector: 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
  • CWE-770: Allocation of Resources Without Limits or Throttling

Mitigation and recommended actions

  • Immediate: Upgrade affected ArmorStart LT devices to firmware v2.002 or later, available via the Rockwell Automation downloads portal.
  • If patching is not immediately possible:
    • Restrict network access to the device’s embedded web server to trusted management networks only, using firewalls or network segmentation.
    • Avoid exposing ArmorStart LT web interfaces directly to the internet or untrusted networks.
    • Apply Rockwell Automation’s general industrial control system security best practices, including network segmentation, use of VPNs for remote access, and monitoring for anomalous HTTP traffic to device management interfaces.

References

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