{"id":"CVE-2025-40820","state":"PUBLISHED","title":"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 at","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.","publishedAt":"2025-12-09T10:44:30.977Z","updatedAt":"2025-12-09T15:55:23.400Z","severity":{"score":8.7,"label":"High","version":"4.0","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","source":"siemens"},"assigner":"siemens","products":["Siemens SIDOOR ATD430W","Siemens SIDOOR ATE530G COATED","Siemens SIDOOR ATE530S COATED","Siemens SIMATIC CFU DIQ","Siemens SIMATIC CFU PA","Siemens SIMATIC ET 200AL IM 157-1 PN","Siemens SIMATIC ET 200clean, CM 8x IO-Link","Siemens SIMATIC ET 200clean, DI 16x24VDC","Siemens SIMATIC ET 200clean, DIQ 16x24VDC/0,5A","Siemens SIMATIC ET 200eco PN, AI 8xRTD/TC, M12-L","Siemens SIMATIC ET 200eco PN, CM 4x IO-Link, M12-L","Siemens SIMATIC ET 200eco PN, CM 8x IO-Link, M12-L","Siemens SIMATIC ET 200eco PN, DI 16x24VDC, M12-L","Siemens SIMATIC ET 200eco PN, DI 8x24VDC, M12-L","Siemens SIMATIC ET 200eco PN, DIQ 16x24VDC/2A, M12-L","Siemens SIMATIC ET 200eco PN, DQ 8x24VDC/0,5A, M12-L","Siemens SIMATIC ET 200eco PN, DQ 8x24VDC/2A, M12-L","Siemens SIMATIC ET 200MP IM 155-5 PN HF","Siemens SIMATIC ET 200pro IM 154-8 PN/DP CPU","Siemens SIMATIC ET 200pro IM 154-8F PN/DP CPU","Siemens SIMATIC ET 200pro IM 154-8FX PN/DP CPU","Siemens SIMATIC ET 200S IM 151-8 PN/DP CPU","Siemens SIMATIC ET 200S IM 151-8F PN/DP CPU","Siemens SIMATIC ET 200SP CPU 1510SP F-1 PN","Siemens SIMATIC ET 200SP CPU 1510SP-1 PN","Siemens SIMATIC ET 200SP CPU 1512SP F-1 PN","Siemens SIMATIC ET 200SP CPU 1512SP-1 PN","Siemens SIMATIC ET 200SP IM 155-6 MF HF","Siemens SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants)","Siemens SIMATIC ET 200SP IM 155-6 PN HF","Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF","Siemens SIMATIC ET 200SP IM 155-6 PN/3 HF","Siemens SIMATIC PN/MF Coupler","Siemens SIMATIC PN/PN Coupler","Siemens SIMATIC Power Line Booster PLB, Base Module","Siemens SIMATIC Power Line Booster PLB, Modem Module ST","Siemens SIMATIC S7-1200 CPU 1211C AC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1211C DC/DC/DC","Siemens SIMATIC S7-1200 CPU 1211C DC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1212C AC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1212C DC/DC/DC","Siemens SIMATIC S7-1200 CPU 1212C DC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1212FC DC/DC/DC","Siemens SIMATIC S7-1200 CPU 1212FC DC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1214C AC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1214C DC/DC/DC","Siemens SIMATIC S7-1200 CPU 1214C DC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1214FC DC/DC/DC","Siemens SIMATIC S7-1200 CPU 1214FC DC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1215C AC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1215C DC/DC/DC","Siemens SIMATIC S7-1200 CPU 1215C DC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1215FC DC/DC/DC","Siemens SIMATIC S7-1200 CPU 1215FC DC/DC/Rly","Siemens SIMATIC S7-1200 CPU 1217C DC/DC/DC","Siemens SIMATIC S7-1500 CPU 1511-1 PN","Siemens SIMATIC S7-1500 CPU 1511F-1 PN","Siemens SIMATIC S7-1500 CPU 1513-1 PN","Siemens SIMATIC S7-1500 CPU 1513F-1 PN","Siemens SIMATIC S7-1500 CPU 1515-2 PN","Siemens SIMATIC S7-1500 CPU 1515F-2 PN","Siemens SIMATIC S7-1500 CPU 1516-3 PN/DP","Siemens SIMATIC S7-1500 CPU 1516F-3 PN/DP","Siemens SIMATIC S7-200 SMART CPU CR40","Siemens SIMATIC S7-200 SMART CPU CR60","Siemens SIMATIC S7-200 SMART CPU SR20","Siemens SIMATIC S7-200 SMART CPU SR30","Siemens SIMATIC S7-200 SMART CPU SR40","Siemens SIMATIC S7-200 SMART CPU SR60","Siemens SIMATIC S7-200 SMART CPU ST20","Siemens SIMATIC S7-200 SMART CPU ST30","Siemens SIMATIC S7-200 SMART CPU ST40","Siemens SIMATIC S7-200 SMART CPU ST60","Siemens SIMATIC S7-300 CPU 314C-2 PN/DP","Siemens SIMATIC S7-300 CPU 315-2 PN/DP","Siemens SIMATIC S7-300 CPU 315F-2 PN/DP","Siemens SIMATIC S7-300 CPU 315T-3 PN/DP","Siemens SIMATIC S7-300 CPU 317-2 PN/DP","Siemens SIMATIC S7-300 CPU 317F-2 PN/DP","Siemens SIMATIC S7-300 CPU 317T-3 PN/DP","Siemens SIMATIC S7-300 CPU 317TF-3 PN/DP","Siemens SIMATIC S7-300 CPU 319-3 PN/DP","Siemens SIMATIC S7-300 CPU 319F-3 PN/DP","Siemens SIMATIC S7-400 CPU 412-2 PN V7","Siemens SIMATIC S7-400 CPU 414-3 PN/DP V7","Siemens SIMATIC S7-400 CPU 414F-3 PN/DP V7","Siemens SIMATIC S7-400 CPU 416-3 PN/DP V7","Siemens SIMATIC S7-400 CPU 416F-3 PN/DP V7","Siemens SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants)","Siemens SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants)","Siemens SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants)","Siemens SIMATIC TDC CP51M1","Siemens SIMATIC TDC CPU555","Siemens SIMOCODE pro V Ethernet/IP (incl. SIPLUS variants)","Siemens SIMOCODE pro V PROFINET","Siemens SINUMERIK 840D sl","Siemens SIPLUS ET 200MP IM 155-5 PN HF","Siemens SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL","Siemens SIPLUS ET 200S IM 151-8 PN/DP CPU","Siemens SIPLUS ET 200S IM 151-8F PN/DP CPU","Siemens SIPLUS ET 200SP CPU 1512SP F-1 PN","Siemens SIPLUS ET 200SP IM 155-6 PN HF","Siemens SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL","Siemens SIPLUS ET 200SP IM 155-6 PN HF TX RAIL","Siemens SIPLUS HCS4200 CIM4210","Siemens SIPLUS HCS4200 CIM4210C","Siemens SIPLUS HCS4300 CIM4310","Siemens SIPLUS NET PN/PN Coupler","Siemens SIPLUS S7-1200 CPU 1212 AC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1212 DC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1212C AC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1212C DC/DC/DC","Siemens SIPLUS S7-1200 CPU 1212C DC/DC/DC RAIL","Siemens SIPLUS S7-1200 CPU 1214 AC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1214 DC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1214C AC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1214C DC/DC/DC","Siemens SIPLUS S7-1200 CPU 1214C DC/DC/DC RAIL","Siemens SIPLUS S7-1200 CPU 1214C DC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1214FC DC/DC/DC","Siemens SIPLUS S7-1200 CPU 1214FC DC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1215 AC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1215 DC/DC/DC","Siemens SIPLUS S7-1200 CPU 1215 DC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1215C AC/DC/RLY","Siemens SIPLUS S7-1200 CPU 1215C DC/DC/DC","Siemens SIPLUS S7-1200 CPU 1215FC DC/DC/DC","Siemens SIPLUS S7-1500 CPU 1511-1 PN","Siemens SIPLUS S7-1500 CPU 1511F-1 PN","Siemens SIPLUS S7-1500 CPU 1513-1 PN","Siemens SIPLUS S7-1500 CPU 1513F-1 PN","Siemens SIPLUS S7-1500 CPU 1516-3 PN/DP","Siemens SIPLUS S7-1500 CPU 1516F-3 PN/DP","Siemens SIPLUS S7-300 CPU 314C-2 PN/DP","Siemens SIPLUS S7-300 CPU 315-2 PN/DP","Siemens SIPLUS S7-300 CPU 315F-2 PN/DP","Siemens SIPLUS S7-300 CPU 317-2 PN/DP","Siemens SIPLUS S7-300 CPU 317F-2 PN/DP","Siemens SIPLUS S7-400 CPU 414-3 PN/DP V7","Siemens SIPLUS S7-400 CPU 416-3 PN/DP V7","Siemens SIWAREX WP231","Siemens SIWAREX WP241","Siemens SIWAREX WP251","Siemens SIWAREX WP521 ST","Siemens SIWAREX WP522 ST"],"affected":[{"vendor":"Siemens","product":"SIDOOR ATD430W","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIDOOR ATE530G COATED","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIDOOR ATE530S COATED","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC CFU DIQ","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V2.0.0","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC CFU PA","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V2.0.0","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC CFU 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M12-L","defaultStatus":"unknown","versions":[{"version":"V5.1.1","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200eco PN, CM 4x IO-Link, M12-L","defaultStatus":"unknown","versions":[{"version":"V5.1.1","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200eco PN, CM 8x IO-Link, M12-L","defaultStatus":"unknown","versions":[{"version":"V5.1.1","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200eco PN, CM 8x IO-Link, M12-L","defaultStatus":"unknown","versions":[{"version":"V5.1.1","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200eco PN, DI 16x24VDC, M12-L","defaultStatus":"unknown","versions":[{"version":"V5.1.1","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200eco PN, DI 8x24VDC, M12-L","defaultStatus":"unknown","versions":[{"version":"V5.1.1","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200eco PN, DIQ 16x24VDC/2A, M12-L","defaultStatus":"unknown","versions":[{"version":"V5.1.1","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200eco PN, DQ 8x24VDC/0,5A, M12-L","defaultStatus":"unknown","versions":[{"version":"V5.1.1","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200eco PN, DQ 8x24VDC/2A, M12-L","defaultStatus":"unknown","versions":[{"version":"V5.1.1","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200MP IM 155-5 PN HF","defaultStatus":"unknown","versions":[{"version":"V4.2.0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200pro IM 154-8 PN/DP CPU","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200pro IM 154-8F PN/DP CPU","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200pro IM 154-8FX PN/DP CPU","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200S IM 151-8 PN/DP CPU","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200S IM 151-8F PN/DP CPU","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200SP CPU 1510SP F-1 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SIPLUS variants)","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V1.3","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200SP IM 155-6 PN HF","defaultStatus":"unknown","versions":[{"version":"V4.2.0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200SP IM 155-6 PN/2 HF","defaultStatus":"unknown","versions":[{"version":"V4.2.0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC ET 200SP IM 155-6 PN/3 HF","defaultStatus":"unknown","versions":[{"version":"V4.2.0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC PN/MF Coupler","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC PN/PN Coupler","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V6.0.0","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC Power Line Booster PLB, Base Module","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC Power Line Booster PLB, Modem Module ST","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1200 CPU 1211C AC/DC/Rly","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V4.4.0","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1200 CPU 1211C DC/DC/DC","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V4.4.0","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1200 CPU 1211C DC/DC/Rly","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V4.4.0","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1200 CPU 1212C AC/DC/Rly","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V4.4.0","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1200 CPU 1212C DC/DC/DC","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V4.4.0","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1200 CPU 1212C DC/DC/Rly","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V4.4.0","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1200 CPU 1212FC DC/DC/DC","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"V4.4.0","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1200 CPU 1212FC 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CR40","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-200 SMART CPU CR60","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-200 SMART CPU SR20","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-200 SMART CPU SR20","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-200 SMART CPU SR30","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-200 SMART CPU 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