{"id":"CVE-2026-35227","state":"PUBLISHED","title":"Improper resource management in CODESYS Modbus TCP Server","description":"An unauthenticated remote attacker may exhaust all available TCP connections in the CODESYS Modbus TCP Server stack if a race condition in connection handling is successfully exploited, preventing legitimate clients from establishing new connections.","publishedAt":"2026-05-12T07:14:41.517Z","updatedAt":"2026-05-13T14:38:41.132Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"CERTVDE"},"assigner":"CERTVDE","products":["CODESYS CODESYS Modbus"],"affected":[{"vendor":"CODESYS","product":"CODESYS Modbus","defaultStatus":"unaffected","versions":[{"version":"1.0.0.0","status":"affected","lessThan":"4.6.0.0","versionType":"semver"}]}],"references":["https://certvde.com/de/advisories/VDE-2026-042"],"weaknesses":["CWE-772"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/35xxx/CVE-2026-35227.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-35227","state":"PUBLISHED","datePublished":"2026-05-12T07:14:41.517Z","dateUpdated":"2026-05-13T14:38:41.132Z","assignerShortName":"CERTVDE","assignerOrgId":"270ccfa6-a436-4e77-922e-914ec3a9685c","dateReserved":"2026-04-01T19:54:21.499Z"},"containers":{"cna":{"title":"Improper resource management in CODESYS Modbus TCP Server","descriptions":[{"lang":"en","value":"An unauthenticated remote attacker may exhaust all available TCP connections in the CODESYS Modbus TCP Server stack if a race condition in connection handling is successfully exploited, preventing legitimate clients from establishing new connections."}],"affected":[{"vendor":"CODESYS","product":"CODESYS Modbus","defaultStatus":"unaffected","versions":[{"version":"1.0.0.0","status":"affected","lessThan":"4.6.0.0","versionType":"semver"}]}],"references":[{"url":"https://certvde.com/de/advisories/VDE-2026-042"}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-772","description":"CWE-772 Missing Release of Resource after Effective Lifetime","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CERTVDE","orgId":"270ccfa6-a436-4e77-922e-914ec3a9685c","dateUpdated":"2026-05-12T07:14:41.517Z"},"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:codesys:codesys_modbus:*:*:*:*:*:*:*:*","versionEndExcluding":"4.6.0.0","versionStartIncluding":"1.0.0.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"OR"}],"credits":[{"lang":"en","type":"finder","user":"00000000-0000-4000-9000-000000000000","value":"ABB Schweiz AG"}],"source":{"advisory":"VDE-2026-042","defect":["CERT@VDE#642013"],"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.1.0-dev"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T14:29:08.743627Z","id":"CVE-2026-35227","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-13T14:38:41.132Z"}}]}}}