{"id":"CVE-2025-40939","title":"A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1)","summary":"A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected device contains a USB port which allows unauthenticated connections. This could allow an attacker with physical access to the device to trigger …","severity":"medium","cvss":4.6,"cvssVector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-284"],"vendor":"siemens","product":"simatic_cn_4100_firmware","affected":["simatic_cn_4100_firmware < 4.0.1"],"patched":["simatic_cn_4100_firmware 4.0.1"],"published":"2025-12-09","updated":"2026-10-07","sourceUpdated":"2026-10-07T20:10:01.970","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-40939","references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-416652.html","label":"productcert@siemens.com"}],"tags":["nvd"],"epss":0.00213,"epssPercentile":0.10581,"ingestedAt":"2026-10-07T20:46:46.792Z","slug":"CVE-2025-40939","body":"## Overview\n\nA vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected device contains a USB port which allows unauthenticated connections. This could allow an attacker with physical access to the device to trigger reboot that could cause denial of service condition.\n\n## Affected\n\n- `simatic_cn_4100_firmware < 4.0.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `simatic_cn_4100_firmware 4.0.1`","depth":"sunlit","depthScore":25,"depthScoreParts":{"impact":25.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}