Rockwell Automation Allen-Bradley ControlLogix Communication Modules vulnerable to Denial of Service
Priority MEDIUM 45CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03705 89th 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Rockwell | 1756-EN4TR Series A | up to 5.001 | — | No fix listed | CNA |
| Rockwell | 1756-EN4TRK Series A | up to 5.001 | — | No fix listed | CNA |
| Rockwell | 1756-EN4TRXT Series A | up to 5.001 | — | No fix listed | CNA |
- 1756-EN4TR Series A VendorRockwell Affected up to 5.001 Fixed in — No fix listed CNA
- 1756-EN4TRK Series A VendorRockwell Affected up to 5.001 Fixed in — No fix listed CNA
- 1756-EN4TRXT Series A VendorRockwell Affected up to 5.001 Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:rockwellautomation:1756-en4tr_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Rockwell |
| cpe:2.3:h:rockwellautomation:1756-en4tr:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Rockwell |
| cpe:2.3:o:rockwellautomation:1756-en4trk_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Rockwell |
| cpe:2.3:h:rockwellautomation:1756-en4trk:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Rockwell |
| cpe:2.3:o:rockwellautomation:1756-en4trxt_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Rockwell |
| cpe:2.3:h:rockwellautomation:1756-en4trxt:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Rockwell |
- cpe:2.3:o:rockwellautomation:1756-en4tr_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Rockwell
- cpe:2.3:h:rockwellautomation:1756-en4tr:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Rockwell
- cpe:2.3:o:rockwellautomation:1756-en4trk_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Rockwell
- cpe:2.3:h:rockwellautomation:1756-en4trk:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Rockwell
- cpe:2.3:o:rockwellautomation:1756-en4trxt_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Rockwell
- cpe:2.3:h:rockwellautomation:1756-en4trxt:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Rockwell
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-3596
- 2026-10-03 Alias added: GHSA-xvq9-c88q-jf5x
References
More Rockwell 1756-en4tr Firmware vulnerabilities
- TI-2024-08002 Logix Controllers Vulnerable to Denial-of-Service Vulnerability CVSS 4.0HIGH 8.7
- TI-2024-03258 Rockwell Automation ControlLogix and GaurdLogix Vulnerable to Major Nonrecoverable Fault Due to Invalid Header Value CVSS 3.1HIGH 8.6
- TI-2025-07328 Rockwell Automation 1756-ENT2R, EN4TR, EN4TRXT Vulnerability CVSS 4.0HIGH 7.1
- TI-2025-07327 Rockwell Automation 1756-ENT2R, EN4TR, EN4TRXT Vulnerability CVSS 4.0HIGH 7.1
Sources
- CVE-2023-3596 · CVE Program
- CVE-2023-3596 · NVD
- FIRST EPSS
- GHSA-xvq9-c88q-jf5x · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences