{"id":"CVE-2021-33719","aliases":["EUVD-2021-20396","GHSA-6936-h7xw-gfq3"],"status":"published","title":"A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions \u003c...","description":"A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions \u003c V8.80), SIPROTEC 5 relays with CPU variants CP100 (All versions \u003c V8.80), SIPROTEC 5 relays with CPU variants CP300 (All versions \u003c V8.80). Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition or potential remote code execution.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.02156,"percentile":0.82437,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2021-09-14T10:47:35Z","modified":"2026-06-17T03:55:06Z","products":[{"vendor":"siemens","product":"siprotec 5 relays with cpu variants cp050"},{"vendor":"siemens","product":"siprotec 5 relays with cpu variants cp100"},{"vendor":"siemens","product":"siprotec 5 relays with cpu variants cp300"},{"vendor":"siemens","product":"siprotec_5_with_cpu_variant_cp050"},{"vendor":"siemens","product":"siprotec_5_with_cpu_variant_cp100"},{"vendor":"siemens","product":"siprotec_5_with_cpu_variant_cp300"}],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33719"},{"url":"https://github.com/advisories/GHSA-6936-h7xw-gfq3"}],"sources":{"cve":[{"id":"CVE-2021-33719","description":"A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions \u003c V8.80), SIPROTEC 5 relays with CPU variants CP100 (All versions \u003c V8.80), SIPROTEC 5 relays with CPU variants CP300 (All versions \u003c V8.80). Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition or potential remote code execution.","status":"published","published":"2021-09-14T10:47:35Z","modified":"2024-08-03T23:58:22.916Z","cwes":["CWE-120"],"updated_at":"2026-11-02T14:33:10.204494Z"}],"euvd":[{"id":"EUVD-2021-20396","description":"A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions \u003c V8.80), SIPROTEC 5 relays with CPU variants CP100 (All versions \u003c V8.80), SIPROTEC 5 relays with CPU variants CP300 (All versions \u003c V8.80). Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition or potential remote code execution.","status":"published","published":"2021-09-14T10:47:35Z","modified":"2024-08-03T23:58:22Z","updated_at":"2026-11-03T03:24:33.318275Z"}],"ghsa":[{"id":"GHSA-6936-h7xw-gfq3","title":"A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions \u003c...","description":"A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions \u003c V8.80), SIPROTEC 5 relays with CPU variants CP100 (All versions \u003c V8.80), SIPROTEC 5 relays with CPU variants CP200 (All versions), SIPROTEC 5 relays with CPU variants CP300 (All versions \u003c V8.80). Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition or potential remote code execution.","status":"published","published":"2022-05-24T19:14:32Z","modified":"2023-01-30T05:02:13Z","cwes":["CWE-120"],"updated_at":"2026-11-02T14:46:35.666418Z"}],"nvd":[{"id":"CVE-2021-33719","description":"A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions \u003c V8.80), SIPROTEC 5 relays with CPU variants CP100 (All versions \u003c V8.80), SIPROTEC 5 relays with CPU variants CP300 (All versions \u003c V8.80). Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition or potential remote code execution.","status":"published","published":"2021-09-14T11:15:24.447Z","modified":"2026-06-17T03:55:06.14Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:06:58.502206Z"}]}}