{"id":"CVE-2026-9653","aliases":["EUVD-2026-43695","GHSA-w8xr-7458-qr4m"],"status":"published","title":"1756-EN2, 1756-EN3, and 1756-ENBT - Denial of Service via CIP Connection ID","description":"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.","severity":{"version":"4.0","score":8.7,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.00231,"percentile":0.14081,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-354"],"published":"2026-07-14T15:00:06Z","modified":"2026-07-14T16:46:49Z","products":[{"vendor":"rockwell automation","product":"1756-en2, 1756-en3"},{"vendor":"rockwell automation","product":"1756-enbt"}],"references":[{"url":"https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1780.html"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9653"},{"url":"https://github.com/advisories/GHSA-w8xr-7458-qr4m"}],"sources":{"cve":[{"id":"CVE-2026-9653","title":"1756-EN2, 1756-EN3, and 1756-ENBT - Denial of Service via CIP Connection ID","description":"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.","status":"published","published":"2026-07-14T15:00:06.196Z","modified":"2026-07-14T15:25:27.797Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-354"],"updated_at":"2026-11-02T13:42:37.965383Z"}],"euvd":[{"id":"EUVD-2026-43695","description":"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.","status":"published","published":"2026-07-14T15:00:06Z","modified":"2026-07-14T15:25:27Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"updated_at":"2026-11-02T18:19:59.713046Z"}],"ghsa":[{"id":"GHSA-w8xr-7458-qr4m","title":"A denial-of-service security issue exists across all the 1756-EN2, EN3, and ENBT communication...","description":"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.","status":"published","published":"2026-07-14T15:32:18Z","modified":"2026-07-14T15:32:26Z","cvss":[{"version":"4.0","score":8.7,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-354"],"updated_at":"2026-11-02T15:09:27.635559Z"}],"nvd":[{"id":"CVE-2026-9653","description":"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.","status":"published","published":"2026-07-14T15:17:11.347Z","modified":"2026-07-14T16:46:49.03Z","cvss":[{"version":"4.0","score":8.7,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-354"],"updated_at":"2026-11-02T14:12:29.114188Z"}]}}