{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40820","assignerOrgId":"cec7a2ec-15b4-4faf-bd53-b40f371f3a77","state":"PUBLISHED","assignerShortName":"siemens","dateReserved":"2025-04-16T08:50:26.975Z","datePublished":"2025-12-09T10:44:30.977Z","dateUpdated":"2025-12-09T15:55:23.400Z"},"containers":{"cna":{"providerMetadata":{"orgId":"cec7a2ec-15b4-4faf-bd53-b40f371f3a77","shortName":"siemens","dateUpdated":"2025-12-09T10:44:30.977Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Siemens","product":"SIDOOR ATD430W","versions":[{"status":"affected","version":"0","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIDOOR ATE530G COATED","versions":[{"status":"affected","version":"0","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIDOOR ATE530S COATED","versions":[{"status":"affected","version":"0","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC CFU DIQ","versions":[{"status":"affected","version":"0","lessThan":"V2.0.0","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC CFU 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