{"id":"CVE-2026-35227","aliases":["EUVD-2026-29390","GHSA-qc33-pwh4-j9rq"],"status":"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.","severity":{"version":"4.0","score":8.2,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00351,"percentile":0.29063,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-772"],"published":"2026-05-12T07:14:41Z","modified":"2026-10-26T18:10:00Z","products":[{"vendor":"codesys","product":"codesys modbus"}],"references":[{"url":"https://certvde.com/de/advisories/VDE-2026-042"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35227"},{"url":"https://github.com/advisories/GHSA-qc33-pwh4-j9rq"}],"sources":{"cve":[{"id":"CVE-2026-35227","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.","status":"published","published":"2026-05-12T07:14:41.517Z","modified":"2026-05-13T14:38:41.132Z","cvss":[{"version":"4.0","score":8.2,"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","level":"high","assessor":"cna"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T14:20:05.15083Z"}],"euvd":[{"id":"EUVD-2026-29390","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.","status":"published","published":"2026-05-12T07:14:41Z","modified":"2026-05-13T14:38:41Z","cvss":[{"version":"4.0","score":8.2,"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","level":"high"}],"updated_at":"2026-11-02T19:04:33.75998Z"}],"ghsa":[{"id":"GHSA-qc33-pwh4-j9rq","title":"An unauthenticated remote attacker may exhaust all available TCP connections in the CODESYS...","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.","status":"published","published":"2026-05-12T09:31:30Z","modified":"2026-05-12T09:31:30Z","cvss":[{"version":"4.0","score":8.2,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T15:08:00.106388Z"}],"nvd":[{"id":"CVE-2026-35227","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.","status":"published","published":"2026-05-12T08:16:08.193Z","modified":"2026-10-26T18:10:00.173Z","cvss":[{"version":"4.0","score":8.2,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-772"],"updated_at":"2026-11-02T14:12:18.613259Z"}]}}