{"answers":{"affected":"It affects 48 products.","exploited":"There is no known exploitation of CVE-2021-37205 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-37205 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-37205 is a high-severity denial of service vulnerability in Siemens SIMATIC Drive Controller family, published on 9 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-37205 and fix it if it is affected.\n\nWhat it is: CVE-2021-37205 is a high-severity denial of service vulnerability in Siemens SIMATIC Drive Controller family, published on 9 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-37205 in the wild and no public exploit code.\n\nAffected product: Siemens SIMATIC Drive Controller family. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-37205/ (Markdown: https://insights.sbomify.com/CVE-2021-37205/index.md)","id":"CVE-2021-37205","markdown":"https://insights.sbomify.com/CVE-2021-37205/index.md","name":"CVE-2021-37205","record":{"aliases":["GHSA-78f8-w6wx-97fh"],"analysis":{"component_type":"ics_ot","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Siemens SIMATIC PLC","requires_auth":"none","summary":"An unauthenticated attacker can cause a denial-of-service condition in Siemens SIMATIC PLCs by sending specially crafted packets, requiring a device restart to recover.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"siemens","cpe":[{"product":"simatic_drive_controller_cpu_1504d_tf_firmware","vendor":"siemens"},{"product":"simatic_drive_controller_cpu_1507d_tf_firmware","vendor":"siemens"},{"product":"simatic_et_200sp_open_controller_cpu_1515sp_pc2_firmware","vendor":"siemens"},{"product":"simatic_s7-1200_cpu_1211c_firmware","vendor":"siemens"},{"product":"simatic_s7-1200_cpu_1212c_firmware","vendor":"siemens"},{"product":"simatic_s7-1200_cpu_1212fc_firmware","vendor":"siemens"},{"product":"simatic_s7-1200_cpu_1214c_firmware","vendor":"siemens"},{"product":"simatic_s7-1200_cpu_1214fc_firmware","vendor":"siemens"},{"product":"simatic_s7-1200_cpu_1215c_firmware","vendor":"siemens"},{"product":"simatic_s7-1200_cpu_1215fc_firmware","vendor":"siemens"},{"product":"simatic_s7-1200_cpu_1217c_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1510sp-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1510sp_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1511-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1511c-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1511f-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1511t-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1511tf-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1512c-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1512sp-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1512spf-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1513-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1513f-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1513r-1_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1515-2_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1515f-2_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1515r-2_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1515t-2_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1515tf-2_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1516-3_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1516f-3_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1516pro-2_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1516pro_f_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1516t-3_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1516tf-3_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1517-3_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1517f-3_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1517tf-3_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1518-4_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1518f-4_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1518hf-4_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1518t-4_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_1518tf-4_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_cpu_1513pro-2_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_cpu_cpu_1513prof-2_firmware","vendor":"siemens"},{"product":"simatic_s7-1500_software_controller","vendor":"siemens"},{"product":"simatic_s7-plcsim_advanced_firmware","vendor":"siemens"},{"product":"tim_1531_irc_firmware","vendor":"siemens"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","version":"3.1"},"cwes":[{"id":"CWE-401","name":"Missing Release of Memory after Effective Lifetime"}],"description":"A vulnerability has been identified in SIMATIC Drive Controller family (All versions \u003e= V2.9.2 \u003c V2.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions \u003e= V21.9 \u003c V21.9.4), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions \u003e= V4.5.0 \u003c V4.5.2), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions \u003e= V2.9.2 \u003c V2.9.4), SIMATIC S7-1500 Software Controller (All versions \u003e= V21.9 \u003c V21.9.4), SIMATIC S7-PLCSIM Advanced (All versions \u003e= V4.0 \u003c V4.0 SP1), SIPLUS TIM 1531 IRC (All versions \u003c V2.3.6), TIM 1531 IRC (All versions \u003c 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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Denial of service in SIMATIC Drive Controller family","id":"CVE-2021-37205","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Denial of service in SIPROTEC 5 relays with CPU variants CP050","id":"CVE-2021-37206"},"packages":[],"prev":{"headline":"Denial of service in SIMATIC Drive Controller family","id":"CVE-2021-37204"},"products":["SIMATIC Drive Controller family","SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants)","SIMATIC S7-1200 CPU family (incl. SIPLUS variants)","SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants)","SIMATIC S7-1500 Software Controller","SIMATIC S7-PLCSIM Advanced","SIPLUS TIM 1531 IRC","TIM 1531 IRC"],"published":"2022-02-09","related":[{"cvss_score":9.3,"headline":"Weak cryptography in SIMATIC Drive Controller family","id":"CVE-2022-38465","kev_date_added":null,"published":"2022-10-11"},{"cvss_score":7.5,"headline":"Use after free in SIMATIC Drive Controller CPU 1504D TF","id":"CVE-2023-46156","kev_date_added":null,"published":"2023-12-12"},{"cvss_score":7.5,"headline":"Denial of service in SIMATIC Drive Controller family","id":"CVE-2021-37185","kev_date_added":null,"published":"2022-02-09"},{"cvss_score":7.5,"headline":"Denial of service in SIMATIC Drive Controller family","id":"CVE-2021-37204","kev_date_added":null,"published":"2022-02-09"},{"cvss_score":4.6,"headline":"Security feature bypass in SIMATIC Drive Controller CPU 1504D TF","id":"CVE-2022-38773","kev_date_added":null,"published":"2023-01-10"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-04-18","vendors":["Siemens"]},"summary":"An unauthenticated attacker can cause a denial-of-service condition in Siemens SIMATIC PLCs by sending specially crafted packets, requiring a device restart to recover.","url":"https://insights.sbomify.com/CVE-2021-37205/"}