{"id":"CVE-2026-10831","aliases":["EUVD-2026-37119","GHSA-fxj4-v3m4-37hj"],"status":"published","title":"Improper Authorization of Break Signal Commands in Devices","description":"A denial-of-service vulnerability exists in NPort devices because of improper access control on the command port. The command interface does not properly validate whether a sender is associated with a valid data port session before accepting break signal commands. A remote attacker with network access can send crafted requests to disrupt serial communication for an active user session.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00292,"percentile":0.22003,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-862"],"published":"2026-06-16T13:46:27Z","modified":"2026-06-17T10:12:35Z","products":[{"vendor":"moxa","product":"cn2600 series"},{"vendor":"moxa","product":"nport 6000 series"}],"references":[{"url":"https://www.moxa.com/en/support/product-support/security-advisory/mpsa-262370-cve-2026-10831-improper-authorization-vulnerability-in-serial-device-servers","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-10831"},{"url":"https://github.com/advisories/GHSA-fxj4-v3m4-37hj"}],"sources":{"cve":[{"id":"CVE-2026-10831","title":"Improper Authorization of Break Signal Commands in Devices","description":"A denial-of-service vulnerability exists in NPort devices because of improper access control on the command port. The command interface does not properly validate whether a sender is associated with a valid data port session before accepting break signal commands. A remote attacker with network access can send crafted requests to disrupt serial communication for an active user session.","status":"published","published":"2026-06-16T13:46:27.325Z","modified":"2026-06-16T15:27:28.093Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:L","level":"medium","assessor":"cna"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T13:40:01.309549Z"}],"euvd":[{"id":"EUVD-2026-37119","description":"A denial-of-service vulnerability exists in NPort devices because of improper access control on the command port. The command interface does not properly validate whether a sender is associated with a valid data port session before accepting break signal commands. A remote attacker with network access can send crafted requests to disrupt serial communication for an active user session.","status":"published","published":"2026-06-16T13:46:27Z","modified":"2026-06-16T15:27:28Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:L","level":"medium"}],"updated_at":"2026-11-02T18:20:40.24472Z"}],"ghsa":[{"id":"GHSA-fxj4-v3m4-37hj","title":"A denial-of-service vulnerability exists in NPort devices because of improper access control on...","description":"A denial-of-service vulnerability exists in NPort devices because of improper access control on the command port. The command interface does not properly validate whether a sender is associated with a valid data port session before accepting break signal commands. A remote attacker with network access can send crafted requests to disrupt serial communication for an active user session.","status":"published","published":"2026-06-16T15:33:51Z","modified":"2026-06-16T15:34:03Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:L/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":"medium"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T15:08:48.835344Z"}],"nvd":[{"id":"CVE-2026-10831","description":"A denial-of-service vulnerability exists in NPort devices because of improper access control on the command port. The command interface does not properly validate whether a sender is associated with a valid data port session before accepting break signal commands. A remote attacker with network access can send crafted requests to disrupt serial communication for an active user session.","status":"published","published":"2026-06-16T15:16:34.49Z","modified":"2026-06-17T10:12:35.883Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:L/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":"medium","assessor":"secondary"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:12:24.19758Z"}]}}