{"answers":{"affected":"It affects 4 products.","exploited":"There is no known exploitation of CVE-2021-40368 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-40368 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-40368 is a high-severity denial of service vulnerability in Siemens  SIMATIC S7-400 CPU 412-1 DP V7, published on 12 Apr 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-2021-40368 and fix it if it is affected.\n\nWhat it is: CVE-2021-40368 is a high-severity denial of service vulnerability in Siemens  SIMATIC S7-400 CPU 412-1 DP V7, published on 12 Apr 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-2021-40368 in the wild and no public exploit code.\n\nAffected product: Siemens  SIMATIC S7-400 CPU 412-1 DP V7. 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-2021-40368/ (Markdown: https://insights.sbomify.com/CVE-2021-40368/index.md)","id":"CVE-2021-40368","markdown":"https://insights.sbomify.com/CVE-2021-40368/index.md","name":"CVE-2021-40368","record":{"aliases":["GHSA-q4w8-vrmx-g9m6"],"analysis":{"component_type":"ics_ot","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Siemens SIMATIC PLC","requires_auth":"none","summary":"An attacker can cause a denial-of-service condition on Siemens SIMATIC S7-400 PLCs by sending specially crafted packets to port 102/tcp.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"siemens","cpe":[{"product":"simatic_s7-400_pn\\/dp_v7_firmware","vendor":"siemens"},{"product":"simatic_s7-400h_v6_firmware","vendor":"siemens"},{"product":"simatic_s7-410_v10_firmware","vendor":"siemens"},{"product":"simatic_s7-410_v8_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-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer"}],"description":"A vulnerability has been identified in  SIMATIC S7-400 CPU 412-1 DP V7 (All versions),  SIMATIC S7-400 CPU 412-2 DP V7 (All versions),  SIMATIC S7-400 CPU 412-2 PN/DP V7 (All versions \u003c V7.0.3),  SIMATIC S7-400 CPU 414-2 DP V7 (All versions),  SIMATIC S7-400 CPU 414-3 DP V7 (All versions),  SIMATIC S7-400 CPU 414-3 PN/DP V7 (All versions \u003c V7.0.3),  SIMATIC S7-400 CPU 414F-3 PN/DP V7 (All versions \u003c V7.0.3),  SIMATIC S7-400 CPU 416-2 DP V7 (All versions),  SIMATIC S7-400 CPU 416-3 DP V7 (All versions),  SIMATIC S7-400 CPU 416-3 PN/DP V7 (All versions \u003c V7.0.3),  SIMATIC S7-400 CPU 416F-2 DP V7 (All versions),  SIMATIC S7-400 CPU 416F-3 PN/DP V7 (All versions \u003c V7.0.3),  SIMATIC S7-400 CPU 417-4 DP V7 (All versions), SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants) (All versions \u003c V6.0.10), SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants) (All versions \u003c V10.1), SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants) (All versions \u003c V8.2.3), SIPLUS S7-400 CPU 414-3 PN/DP V7 (All versions \u003c V7.0.3), SIPLUS S7-400 CPU 416-3 PN/DP V7 (All versions \u003c V7.0.3), SIPLUS S7-400 CPU 416-3 V7 (All versions), SIPLUS S7-400 CPU 417-4 V7 (All versions). Affected devices improperly handle specially crafted packets sent to port 102/tcp.\n\nThis could allow an attacker to create a Denial-of-Service condition. A restart 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 S7-400 CPU 412-1 DP V7","id":"CVE-2021-40368","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":"XSS vulnerability on Denounce plugin","id":"CVE-2021-40369"},"packages":[],"prev":{"headline":"Memory corruption in syngo fastView","id":"CVE-2021-40367"},"products":[" SIMATIC S7-400 CPU 412-1 DP V7"," SIMATIC S7-400 CPU 412-2 DP V7"," SIMATIC S7-400 CPU 412-2 PN/DP V7"," SIMATIC S7-400 CPU 414-2 DP V7"," SIMATIC S7-400 CPU 414-3 DP V7"," SIMATIC S7-400 CPU 414-3 PN/DP V7"," SIMATIC S7-400 CPU 414F-3 PN/DP V7"," SIMATIC S7-400 CPU 416-2 DP V7"," SIMATIC S7-400 CPU 416-3 DP V7"," SIMATIC S7-400 CPU 416-3 PN/DP V7"," SIMATIC S7-400 CPU 416F-2 DP V7"," SIMATIC S7-400 CPU 416F-3 PN/DP V7"," SIMATIC S7-400 CPU 417-4 DP V7","SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants)","SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants)","SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants)","SIPLUS S7-400 CPU 414-3 PN/DP V7","SIPLUS S7-400 CPU 416-3 PN/DP V7","SIPLUS S7-400 CPU 416-3 V7","SIPLUS S7-400 CPU 417-4 V7"],"published":"2022-04-12","related":[],"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":"2025-04-21","vendors":["Siemens"]},"summary":"An attacker can cause a denial-of-service condition on Siemens SIMATIC S7-400 PLCs by sending specially crafted packets to port 102/tcp.","url":"https://insights.sbomify.com/CVE-2021-40368/"}