{"id":"CVE-2014-2251","aliases":["EUVD-2014-2290","GHSA-gc2g-5cgv-c5vh"],"status":"published","title":"The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0...","description":"The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 does not have sufficient entropy, which makes it easier for remote attackers to defeat cryptographic protection mechanisms and hijack sessions via unspecified vectors.","severity":{"version":"2.0","score":8.3,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:C","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.02744,"percentile":0.86284,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2014-03-16T10:00:00Z","modified":"2026-06-17T00:06:17Z","products":[{"vendor":"siemens","product":"simatic_s7-1500_cpu_firmware"}],"references":[{"url":"http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-456423.pdf","tags":["x_refsource_CONFIRM","x_transferred","Patch","Vendor Advisory"]},{"url":"http://ics-cert.us-cert.gov/advisories/ICSA-14-073-01","tags":["x_refsource_MISC","x_transferred","US Government Resource"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-456423.pdf","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2014-2251"},{"url":"https://github.com/advisories/GHSA-gc2g-5cgv-c5vh"}],"sources":{"cve":[{"id":"CVE-2014-2251","description":"The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 does not have sufficient entropy, which makes it easier for remote attackers to defeat cryptographic protection mechanisms and hijack sessions via unspecified vectors.","status":"published","published":"2014-03-16T10:00:00Z","modified":"2024-08-06T10:06:00.2Z","updated_at":"2026-11-02T14:33:43.883586Z"}],"euvd":[{"id":"EUVD-2014-2290","description":"The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 does not have sufficient entropy, which makes it easier for remote attackers to defeat cryptographic protection mechanisms and hijack sessions via unspecified vectors.","status":"published","published":"2014-03-16T10:00:00Z","modified":"2024-08-06T10:06:00Z","updated_at":"2026-11-03T01:57:14.847023Z"}],"ghsa":[{"id":"GHSA-gc2g-5cgv-c5vh","title":"The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0...","description":"The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 does not have sufficient entropy, which makes it easier for remote attackers to defeat cryptographic protection mechanisms and hijack sessions via unspecified vectors.","status":"published","published":"2022-05-13T01:28:34Z","modified":"2023-02-01T05:08:01Z","updated_at":"2026-11-02T14:50:40.02829Z"}],"nvd":[{"id":"CVE-2014-2251","description":"The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 does not have sufficient entropy, which makes it easier for remote attackers to defeat cryptographic protection mechanisms and hijack sessions via unspecified vectors.","status":"published","published":"2014-03-16T14:06:45.867Z","modified":"2026-06-17T00:06:17.847Z","cvss":[{"version":"2.0","score":8.3,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:C","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:02:53.710973Z"}]}}