Skip to content
Fencer Vulns
high 7.5

CVE-2023-3596 json

Rockwell Automation Allen-Bradley ControlLogix Communication Modules vulnerable to Denial of Service

published 2023-07-12 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44246

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.7%
EPSS 3.7% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

Where this vulnerability exists in the Rockwell Automation 1756-EN4* Ethernet/IP communication products, it could allow a malicious user to cause a denial of service by asserting the target system through maliciously crafted CIP messages.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-23-193-01 updated cvss 7.5

Rockwell Automation Select Communication Modules

  • Rockwell Automation 1756-EN2F Series A <= 5.008, <= 5.028 Rockwell Automation 1756-EN2F Series B <= 5.008, <= 5.028
    affected: fixed in 5.029, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2F Series C <= 11.003
    affected: fixed in 11.004, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2FK Series A <= 5.008, <= 5.028 Rockwell Automation 1756-EN2FK Series B <= 5.008, <= 5.028
    affected: fixed in 5.029, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2FK Series C <= 11.003
    affected: fixed in 11.004, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2T Series A <= 5.008, <= 5.028 Rockwell Automation 1756-EN2T Series B <= 5.008, <= 5.028 Rockwell Automation 1756-EN2T Series C <= 5.008, <= 5.028
    affected: fixed in 5.029, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2T Series D <= 11.003
    affected: fixed in 11.004, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2TK Series A <= 5.008, <= 5.028 Rockwell Automation 1756-EN2TK Series B <= 5.008, <= 5.028 Rockwell Automation 1756-EN2TK Series C <= 5.008, <= 5.028
    affected: fixed in 5.029, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2TK Series D <= 11.003 Rockwell Automation 1756-EN2TP Series A <= 11.003 Rockwell Automation 1756-EN2TPK Series A <= 11.003 Rockwell Automation 1756-EN2TPXT Series A <= 11.003
    affected: fixed in 11.004, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
show 13 more
  • Rockwell Automation 1756-EN2TR Series A <= 5.008, <= 5.028 Rockwell Automation 1756-EN2TR Series B <= 5.008, <= 5.028
    affected: fixed in 5.029, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2TR Series C <= 11.003
    affected: fixed in 11.004, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2TRK Series A <= 5.008, <= 5.028 Rockwell Automation 1756-EN2TRK Series B <= 5.008, <= 5.028
    affected: fixed in 5.029, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2TRK Series C <= 11.003
    affected: fixed in 11.004, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2TRXT Series A <= 5.008, <= 5.028 Rockwell Automation 1756-EN2TRXT Series B <= 5.008, <= 5.028
    affected: fixed in 5.029, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2TRXT Series C <= 11.003
    affected: fixed in 11.004, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2TXT Series A <= 5.008, <= 5.028 Rockwell Automation 1756-EN2TXT Series B <= 5.008, <= 5.028 Rockwell Automation 1756-EN2TXT Series C <= 5.008, <= 5.028
    affected: fixed in 5.029, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN2TXT Series D <= 11.003
    affected: fixed in 11.004, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN3TR Series A <= 5.008, <= 5.028
    affected: fixed in 5.029, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN3TR Series B <= 11.003
    affected: fixed in 11.004, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN3TRK Series A <= 5.008, <= 5.028
    affected: fixed in 5.029, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN3TRK Series B <= 11.003
    affected: fixed in 11.004, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com
  • Rockwell Automation 1756-EN4TR Series A <= 5.001 Rockwell Automation 1756-EN4TRK Series A <= 5.001 Rockwell Automation 1756-EN4TRXT Series A <= 5.001
    affected: fixed in 5.002, mitigation “Organizations should take the following actions to further secure ControlLogix communications modules from exploitation:” rockwellautomation.custhelp.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

3.71% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Rockwell Automation 1756-EN4TR Series A
  • Rockwell Automation 1756-EN4TRK Series A
  • Rockwell Automation 1756-EN4TRXT Series A
  • rockwellautomation 1756-en4tr
  • rockwellautomation 1756-en4trk
  • rockwellautomation 1756-en4trxt

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.