{"id":"CVE-2021-37185","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-37185","generatedAt":"2026-10-27T21:09:57.731Z","title":"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.","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.","published":"2022-02-09T16:15:13.000Z","lastModified":"2026-06-17T04:00:13.000Z","status":"Modified","sourceIdentifier":"productcert@siemens.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-672"],"affected":["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-plcsim advanced firmware","siemens/tim 1531 irc firmware","siemens/simatic s7-1500 software controller","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 1214fc firmware","siemens/simatic s7-1200 cpu 1214c firmware","siemens/simatic s7-1200 cpu 1215fc firmware","siemens/simatic s7-1200 cpu 1215c 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 cpu 1513prof-2 firmware","siemens/simatic s7-1500 cpu cpu 1513pro-2 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 1516pro f firmware","siemens/simatic s7-1500 cpu 1516pro-2 firmware","siemens/simatic s7-1500 cpu 1516-3 firmware","siemens/simatic s7-1500 cpu 1516f-3 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"],"epss":{"score":0.0206,"percentile":0.8119,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.06%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-838121.pdf","tags":["Patch","Vendor Advisory"],"source":"productcert@siemens.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-838121.pdf","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-37185","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}