{"id":"CVE-2021-33737","aliases":["EUVD-2021-20414","GHSA-w34c-jjqq-3824"],"status":"published","title":"A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions),...","description":"A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (All versions \u003c V3.3), SIMATIC CP 443-1 (All versions \u003c V3.3), SIMATIC CP 443-1 Advanced (All versions \u003c V3.3), SIPLUS NET CP 443-1 (All versions \u003c V3.3), SIPLUS NET CP 443-1 Advanced (All versions \u003c V3.3). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01056,"percentile":0.64663,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-119"],"published":"2021-09-14T10:47:38Z","modified":"2026-06-17T03:55:08Z","products":[{"vendor":"siemens","product":"simatic cp 343-1 (incl. siplus variants)"},{"vendor":"siemens","product":"simatic cp 343-1 advanced (incl. siplus variants)"},{"vendor":"siemens","product":"simatic cp 343-1 erpc"},{"vendor":"siemens","product":"simatic cp 343-1 lean (incl. siplus variants)"},{"vendor":"siemens","product":"simatic cp 443-1"},{"vendor":"siemens","product":"simatic cp 443-1 advanced"},{"vendor":"siemens","product":"simatic_cp_343-1_advanced_firmware"},{"vendor":"siemens","product":"simatic_cp_343-1_erpc_firmware"},{"vendor":"siemens","product":"simatic_cp_343-1_firmware"},{"vendor":"siemens","product":"simatic_cp_343-1_lean_firmware"},{"vendor":"siemens","product":"simatic_cp_443-1_advanced_firmware"},{"vendor":"siemens","product":"simatic_cp_443-1_firmware"},{"vendor":"siemens","product":"siplus net cp 443-1"},{"vendor":"siemens","product":"siplus net cp 443-1 advanced"}],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-549234.pdf","tags":["x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33737"},{"url":"https://github.com/advisories/GHSA-w34c-jjqq-3824"}],"sources":{"cve":[{"id":"CVE-2021-33737","description":"A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (All versions \u003c V3.3), SIMATIC CP 443-1 (All versions \u003c V3.3), SIMATIC CP 443-1 Advanced (All versions \u003c V3.3), SIPLUS NET CP 443-1 (All versions \u003c V3.3), SIPLUS NET CP 443-1 Advanced (All versions \u003c V3.3). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.","status":"published","published":"2021-09-14T10:47:38Z","modified":"2024-08-03T23:58:22.953Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:33:10.204494Z"}],"euvd":[{"id":"EUVD-2021-20414","description":"A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (All versions \u003c V3.3), SIMATIC CP 443-1 (All versions \u003c V3.3), SIMATIC CP 443-1 Advanced (All versions \u003c V3.3), SIPLUS NET CP 443-1 (All versions \u003c V3.3), SIPLUS NET CP 443-1 Advanced (All versions \u003c V3.3). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.","status":"published","published":"2021-09-14T10:47:38Z","modified":"2024-08-03T23:58:22Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:C","level":"high"}],"updated_at":"2026-11-03T03:24:33.318275Z"}],"ghsa":[{"id":"GHSA-w34c-jjqq-3824","title":"A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions),...","description":"A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 Advanced (incl. SIPLUS variants) (All versions). Sending a specially crafted packet to port 102/tcp of an affected device could cause a Denial-of-Service condition. A restart is needed to restore normal operations.","status":"published","published":"2022-05-24T19:14:31Z","modified":"2023-01-27T05:03:07Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:42:10.716841Z"}],"nvd":[{"id":"CVE-2021-33737","description":"A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (All versions \u003c V3.3), SIMATIC CP 443-1 (All versions \u003c V3.3), SIMATIC CP 443-1 Advanced (All versions \u003c V3.3), SIPLUS NET CP 443-1 (All versions \u003c V3.3), SIPLUS NET CP 443-1 Advanced (All versions \u003c V3.3). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.","status":"published","published":"2021-09-14T11:15:24.8Z","modified":"2026-06-17T03:55:08.007Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:06:58.502206Z"}]}}