How severe is CVE-2023-3596?

CVE-2023-3596 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-3596 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-3596?

CVE-2023-3596 primarily affects Rockwellautomation 1756-en4tr Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-3596?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-3596 published?

CVE-2023-3596 was published on 2023-07-12 and last updated on 2026-06-17.

CVE-2023-3596

CVE-2023-3596 is a high-severity vulnerability in Rockwellautomation 1756-en4tr Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Rockwellautomation 1756-en4tr Firmware
Published: 2023-07-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2023-3596?: 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.
How severe is CVE-2023-3596?: CVE-2023-3596 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-3596 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-3596?: CVE-2023-3596 primarily affects Rockwellautomation 1756-en4tr Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-3596?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-3596 published?: CVE-2023-3596 was published on 2023-07-12 and last updated on 2026-06-17.

References

https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1140010

Affected products (3)

cpe:2.3:o:rockwellautomation:1756-en4tr_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:rockwellautomation:1756-en4trk_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:rockwellautomation:1756-en4trxt_firmware:-:*:*:*:*:*:*:*

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