CVE-2026-96531756-EN2, 1756-EN3, and 1756-ENBT - Denial of Service via CIP Connection ID
Updated under an hour ago ()
Does this affect you?
It affects Rockwell Automation 1756-EN2, 1756-EN3 and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
A denial-of-service security issue exists across all the 1756-EN2, EN3, and ENBT communication module due to improper validation of CIP Implicit Connection packets. An attacker on the network can exploit this by sending crafted packets to continuously disrupt device connections, though device connections will recover immediately after.
- CVSS
- 8.7 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-354
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Rockwell
- NVD analysis
- Awaiting Analysis
- Record last updated
- Jul 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Rockwell Automation 1756-EN2, 1756-EN3 rockwell_automation:1756_en2_1756_en3 (from the name) | 12.001 and before | CNA record |
Rockwell Automation 1756-ENBT rockwell_automation:1756_enbt (from the name) | 6.006 | CNA record |
References
- https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1780.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.