{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40820 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2025-40820 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-40820 is a high-severity denial of service vulnerability in Siemens SIDOOR ATD430W, published on 9 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-40820 and fix it if it is affected.\n\nWhat it is: CVE-2025-40820 is a high-severity denial of service vulnerability in Siemens SIDOOR ATD430W, published on 9 Dec 2025. 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-2025-40820 in the wild and no public exploit code.\n\nAffected product: Siemens SIDOOR ATD430W. 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-2025-40820/ (Markdown: https://insights.sbomify.com/CVE-2025-40820/index.md)","id":"CVE-2025-40820","markdown":"https://insights.sbomify.com/CVE-2025-40820/index.md","name":"CVE-2025-40820","record":{"aliases":["GHSA-84r6-pwmm-h2fw"],"analysis":{"component_type":"ics_ot","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Siemens industrial controllers","requires_auth":"none","summary":"Unauthenticated remote attackers can cause denial of service in Siemens industrial devices by exploiting weak TCP sequence number validation.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"siemens","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-940","name":"Improper Verification of Source of a Communication Channel"}],"description":"Affected products do not properly enforce TCP sequence number validation in specific scenarios but accept values within a broad range. This could allow an unauthenticated remote attacker e.g. to interfere with connection setup, potentially leading to a denial of service. The attack succeeds only if an attacker can inject IP packets with spoofed addresses at precisely timed moments, and it affects only TCP-based services.","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 SIDOOR ATD430W","id":"CVE-2025-40820","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2025"},"n_packages":0,"n_references":1,"next":{"headline":"Other in Siemens Software Center","id":"CVE-2025-40827"},"packages":[],"prev":{"headline":"Business logic in SINEMA Remote Connect Server","id":"CVE-2025-40819"},"products":["SIDOOR ATD430W","SIDOOR ATE530G COATED","SIDOOR ATE530S COATED","SIMATIC CFU DIQ","SIMATIC CFU PA","SIMATIC ET 200AL IM 157-1 PN","SIMATIC ET 200MP IM 155-5 PN HF","SIMATIC ET 200S IM 151-8 PN/DP CPU","SIMATIC ET 200S IM 151-8F PN/DP CPU","SIMATIC ET 200SP CPU 1510SP F-1 PN","SIMATIC ET 200SP CPU 1510SP-1 PN","SIMATIC ET 200SP CPU 1512SP F-1 PN","SIMATIC ET 200SP CPU 1512SP-1 PN","SIMATIC ET 200SP IM 155-6 MF HF","SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)","SIMATIC ET 200SP IM 155-6 PN HF","SIMATIC ET 200SP IM 155-6 PN/2 HF","SIMATIC ET 200SP IM 155-6 PN/3 HF","SIMATIC ET 200clean, CM 8x IO-Link","SIMATIC ET 200clean, DI 16x24VDC","SIMATIC ET 200clean, DIQ 16x24VDC/0,5A","SIMATIC ET 200eco PN, AI 8xRTD/TC, M12-L","SIMATIC ET 200eco PN, CM 4x IO-Link, M12-L","SIMATIC ET 200eco PN, CM 8x IO-Link, M12-L","SIMATIC ET 200eco PN, DI 16x24VDC, M12-L","SIMATIC ET 200eco PN, DI 8x24VDC, M12-L","SIMATIC ET 200eco PN, DIQ 16x24VDC/2A, M12-L","SIMATIC ET 200eco PN, DQ 8x24VDC/0,5A, M12-L","SIMATIC ET 200eco PN, DQ 8x24VDC/2A, M12-L","SIMATIC ET 200pro IM 154-8 PN/DP CPU","SIMATIC ET 200pro IM 154-8F PN/DP CPU","SIMATIC ET 200pro IM 154-8FX PN/DP CPU","SIMATIC PN/MF Coupler","SIMATIC PN/PN Coupler","SIMATIC Power Line Booster PLB, Base Module","SIMATIC Power Line Booster PLB, Modem Module ST","SIMATIC S7-1200 CPU 1211C AC/DC/Rly","SIMATIC S7-1200 CPU 1211C DC/DC/DC","SIMATIC S7-1200 CPU 1211C DC/DC/Rly","SIMATIC S7-1200 CPU 1212C AC/DC/Rly","SIMATIC S7-1200 CPU 1212C DC/DC/DC","SIMATIC S7-1200 CPU 1212C DC/DC/Rly","SIMATIC S7-1200 CPU 1212FC DC/DC/DC","SIMATIC S7-1200 CPU 1212FC DC/DC/Rly","SIMATIC S7-1200 CPU 1214C AC/DC/Rly","SIMATIC S7-1200 CPU 1214C DC/DC/DC","SIMATIC S7-1200 CPU 1214C DC/DC/Rly","SIMATIC S7-1200 CPU 1214FC DC/DC/DC","SIMATIC S7-1200 CPU 1214FC DC/DC/Rly","SIMATIC S7-1200 CPU 1215C AC/DC/Rly","SIMATIC S7-1200 CPU 1215C DC/DC/DC","SIMATIC S7-1200 CPU 1215C DC/DC/Rly","SIMATIC S7-1200 CPU 1215FC DC/DC/DC","SIMATIC S7-1200 CPU 1215FC DC/DC/Rly","SIMATIC S7-1200 CPU 1217C DC/DC/DC","SIMATIC S7-1500 CPU 1511-1 PN","SIMATIC S7-1500 CPU 1511F-1 PN","SIMATIC S7-1500 CPU 1513-1 PN","SIMATIC S7-1500 CPU 1513F-1 PN","SIMATIC S7-1500 CPU 1515-2 PN","SIMATIC S7-1500 CPU 1515F-2 PN","SIMATIC S7-1500 CPU 1516-3 PN/DP","SIMATIC S7-1500 CPU 1516F-3 PN/DP","SIMATIC S7-200 SMART CPU CR40","SIMATIC S7-200 SMART CPU CR60","SIMATIC S7-200 SMART CPU SR20","SIMATIC S7-200 SMART CPU SR30","SIMATIC S7-200 SMART CPU SR40","SIMATIC S7-200 SMART CPU SR60","SIMATIC S7-200 SMART CPU ST20","SIMATIC S7-200 SMART CPU ST30","SIMATIC S7-200 SMART CPU ST40","SIMATIC S7-200 SMART CPU ST60","SIMATIC S7-300 CPU 314C-2 PN/DP","SIMATIC S7-300 CPU 315-2 PN/DP","SIMATIC S7-300 CPU 315F-2 PN/DP","SIMATIC S7-300 CPU 315T-3 PN/DP","SIMATIC S7-300 CPU 317-2 PN/DP","SIMATIC S7-300 CPU 317F-2 PN/DP","SIMATIC S7-300 CPU 317T-3 PN/DP","SIMATIC S7-300 CPU 317TF-3 PN/DP","SIMATIC S7-300 CPU 319-3 PN/DP","SIMATIC S7-300 CPU 319F-3 PN/DP","SIMATIC S7-400 CPU 412-2 PN V7","SIMATIC S7-400 CPU 414-3 PN/DP V7","SIMATIC S7-400 CPU 414F-3 PN/DP V7","SIMATIC S7-400 CPU 416-3 PN/DP V7","SIMATIC S7-400 CPU 416F-3 PN/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)","SIMATIC TDC CP51M1","SIMATIC TDC CPU555","SIMOCODE pro V Ethernet/IP (incl. SIPLUS variants)","SIMOCODE pro V PROFINET","SINUMERIK 840D sl","SIPLUS ET 200MP IM 155-5 PN HF","SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL","SIPLUS ET 200S IM 151-8 PN/DP CPU","SIPLUS ET 200S IM 151-8F PN/DP CPU","SIPLUS ET 200SP CPU 1512SP F-1 PN","SIPLUS ET 200SP IM 155-6 PN HF","SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL","SIPLUS ET 200SP IM 155-6 PN HF TX RAIL","SIPLUS HCS4200 CIM4210","SIPLUS HCS4200 CIM4210C","SIPLUS HCS4300 CIM4310","SIPLUS NET PN/PN Coupler","SIPLUS S7-1200 CPU 1212 AC/DC/RLY","SIPLUS S7-1200 CPU 1212 DC/DC/RLY","SIPLUS S7-1200 CPU 1212C AC/DC/RLY","SIPLUS S7-1200 CPU 1212C DC/DC/DC","SIPLUS S7-1200 CPU 1212C DC/DC/DC RAIL","SIPLUS S7-1200 CPU 1214 AC/DC/RLY","SIPLUS S7-1200 CPU 1214 DC/DC/RLY","SIPLUS S7-1200 CPU 1214C AC/DC/RLY","SIPLUS S7-1200 CPU 1214C DC/DC/DC","SIPLUS S7-1200 CPU 1214C DC/DC/DC RAIL","SIPLUS S7-1200 CPU 1214C DC/DC/RLY","SIPLUS S7-1200 CPU 1214FC DC/DC/DC","SIPLUS S7-1200 CPU 1214FC DC/DC/RLY","SIPLUS S7-1200 CPU 1215 AC/DC/RLY","SIPLUS S7-1200 CPU 1215 DC/DC/DC","SIPLUS S7-1200 CPU 1215 DC/DC/RLY","SIPLUS S7-1200 CPU 1215C AC/DC/RLY","SIPLUS S7-1200 CPU 1215C DC/DC/DC","SIPLUS S7-1200 CPU 1215FC DC/DC/DC","SIPLUS S7-1500 CPU 1511-1 PN","SIPLUS S7-1500 CPU 1511F-1 PN","SIPLUS S7-1500 CPU 1513-1 PN","SIPLUS S7-1500 CPU 1513F-1 PN","SIPLUS S7-1500 CPU 1516-3 PN/DP","SIPLUS S7-1500 CPU 1516F-3 PN/DP","SIPLUS S7-300 CPU 314C-2 PN/DP","SIPLUS S7-300 CPU 315-2 PN/DP","SIPLUS S7-300 CPU 315F-2 PN/DP","SIPLUS S7-300 CPU 317-2 PN/DP","SIPLUS S7-300 CPU 317F-2 PN/DP","SIPLUS S7-400 CPU 414-3 PN/DP V7","SIPLUS S7-400 CPU 416-3 PN/DP V7","SIWAREX WP231","SIWAREX WP241","SIWAREX WP251","SIWAREX WP521 ST","SIWAREX WP522 ST"],"published":"2025-12-09","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2025-12-09","vendors":["Siemens"]},"summary":"Unauthenticated remote attackers can cause denial of service in Siemens industrial devices by exploiting weak TCP sequence number validation.","url":"https://insights.sbomify.com/CVE-2025-40820/"}