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TI-2026-71758 Aliases CVE-2026-12656GHSA-h935-ghxg-4xm5

Denial of service in Rockwell Automation 1732E ArmorBlock I/O

Priority MEDIUM 43CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

Rockwell Automation 1732E ArmorBlock® I/O from 0 through 3.012 is affected. The device mishandles network storm traffic because it allocates resources without limits or throttling (CWE-770). A remote unauthenticated attacker can interrupt communication, cause device faults and affect open TCP and UDP ports, and a power cycle is required to restore normal operation.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

Description from the CNA

A denial-of-service security issue exists in the affected product and version. The security issue stems from improper handling of network storm traffic, which can interrupt communication, cause device faults, and affect open TCP and UDP ports. A power cycle is required to recover the device to its normal state.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00253 16th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Rockwell1732E ArmorBlock® I/Oup to 3.012—No fix listedCNA
  • 1732E ArmorBlock® I/O VendorRockwell Affected up to 3.012 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Rockwell Automation 1732E ArmorBlock® I/O.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-12656
  2. 2026-10-13 Alias added: GHSA-h935-ghxg-4xm5

References

Other 1

  • TI-2023-06904 Cisco is providing an update for the ongoing investigation into observed exploitation of… KEVCVSS 3.1CRITICAL 10.0
  • TI-2021-05574 Insufficiently protected credentials in Rockwell Automation Studio 5000 Logix Designer… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-02735 Rockwell Automation ThinManager Thinserver Software Vulnerable to Input Validation Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2023-02733 Rockwell Automation ThinManager Thinserver Software Vulnerable to Input Validation Vulnerability CVSS 3.1CRITICAL 9.1
  • TI-2010-02837 The WDB target agent debug service in Wind River VxWorks 6.x, 5.x, and earlier, as used… CVSS 3.1CRITICAL 9.8
  • TI-2023-12455 Rockwell Automation ThinManager ThinServer Path Traversal Download CVSS 3.1HIGH 7.5
See all 434 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences