{"cve":"CVE-2021-37185","nvd":{"published":"2022-02-09T16:15:12.823","modified":"2026-06-17T04:00:12.923","status":"Modified","description":"A vulnerability has been identified in SIMATIC Drive Controller family (All versions >= V2.9.2 < V2.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions >= V21.9 < V21.9.4), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions >= V4.5.0 < V4.5.2), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions >= V2.9.2 < V2.9.4), SIMATIC S7-1500 Software Controller (All versions >= V21.9 < V21.9.4), SIMATIC S7-PLCSIM Advanced (All versions >= V4.0 < V4.0 SP1), SIPLUS TIM 1531 IRC (All versions < V2.3.6), TIM 1531 IRC (All versions < V2.3.6). An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packets over port 102/tcp. A restart of the affected device is needed to restore normal operations.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-672"],"references":["https://cert-portal.siemens.com/productcert/pdf/ssa-838121.pdf","https://cert-portal.siemens.com/productcert/pdf/ssa-838121.pdf"],"products":["siemens:simatic_drive_controller_cpu_1504d_tf_firmware","siemens:simatic_drive_controller_cpu_1507d_tf_firmware","siemens:simatic_et_200sp_open_controller_cpu_1515sp_pc2_firmware","siemens:simatic_s7-1200_cpu_1211c_firmware","siemens:simatic_s7-1200_cpu_1212c_firmware","siemens:simatic_s7-1200_cpu_1212fc_firmware","siemens:simatic_s7-1200_cpu_1214c_firmware","siemens:simatic_s7-1200_cpu_1214fc_firmware","siemens:simatic_s7-1200_cpu_1215c_firmware","siemens:simatic_s7-1200_cpu_1215fc_firmware","siemens:simatic_s7-1200_cpu_1217c_firmware","siemens:simatic_s7-1500_cpu_1510sp-1_firmware","siemens:simatic_s7-1500_cpu_1510sp_firmware","siemens:simatic_s7-1500_cpu_1511-1_firmware","siemens:simatic_s7-1500_cpu_1511c-1_firmware","siemens:simatic_s7-1500_cpu_1511f-1_firmware","siemens:simatic_s7-1500_cpu_1511t-1_firmware","siemens:simatic_s7-1500_cpu_1511tf-1_firmware","siemens:simatic_s7-1500_cpu_1512c-1_firmware","siemens:simatic_s7-1500_cpu_1512sp-1_firmware","siemens:simatic_s7-1500_cpu_1512spf-1_firmware","siemens:simatic_s7-1500_cpu_1513-1_firmware","siemens:simatic_s7-1500_cpu_1513f-1_firmware","siemens:simatic_s7-1500_cpu_1513r-1_firmware","siemens:simatic_s7-1500_cpu_1515-2_firmware","siemens:simatic_s7-1500_cpu_1515f-2_firmware","siemens:simatic_s7-1500_cpu_1515r-2_firmware","siemens:simatic_s7-1500_cpu_1515t-2_firmware","siemens:simatic_s7-1500_cpu_1515tf-2_firmware","siemens:simatic_s7-1500_cpu_1516-3_firmware","siemens:simatic_s7-1500_cpu_1516f-3_firmware","siemens:simatic_s7-1500_cpu_1516pro-2_firmware","siemens:simatic_s7-1500_cpu_1516pro_f_firmware","siemens:simatic_s7-1500_cpu_1516t-3_firmware","siemens:simatic_s7-1500_cpu_1516tf-3_firmware","siemens:simatic_s7-1500_cpu_1517-3_firmware","siemens:simatic_s7-1500_cpu_1517f-3_firmware","siemens:simatic_s7-1500_cpu_1517tf-3_firmware","siemens:simatic_s7-1500_cpu_1518-4_firmware","siemens:simatic_s7-1500_cpu_1518f-4_firmware","siemens:simatic_s7-1500_cpu_1518hf-4_firmware","siemens:simatic_s7-1500_cpu_1518t-4_firmware","siemens:simatic_s7-1500_cpu_1518tf-4_firmware","siemens:simatic_s7-1500_cpu_cpu_1513pro-2_firmware","siemens:simatic_s7-1500_cpu_cpu_1513prof-2_firmware","siemens:simatic_s7-1500_software_controller","siemens:simatic_s7-plcsim_advanced_firmware","siemens:tim_1531_irc_firmware"],"source":"nvd","synced_at":"2026-10-19T21:27:20.926095847+00:00"},"epss":{"cve":"CVE-2021-37185","score":0.0206,"percentile":0.81327,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}