{"id":"CVE-2026-42915","aliases":["EUVD-2026-35727","GHSA-3pg4-4j29-q4rr"],"status":"published","title":"Microsoft Windows VMSwitch Denial of Service Vulnerability","description":"Incorrect calculation of buffer size in Windows VMSwitch allows an authorized attacker to deny service locally.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00383,"percentile":0.32624,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-131"],"published":"2026-06-09T17:06:07Z","modified":"2026-11-10T23:24:56Z","products":[{"vendor":"microsoft","product":"windows 10 version 21h2"},{"vendor":"microsoft","product":"windows 10 version 22h2"},{"vendor":"microsoft","product":"windows 11 version 23h2"},{"vendor":"microsoft","product":"windows 11 version 24h2"},{"vendor":"microsoft","product":"windows 11 version 25h2"},{"vendor":"microsoft","product":"windows 11 version 26h1"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_10_21h2"},{"vendor":"microsoft","product":"windows_10_22h2"},{"vendor":"microsoft","product":"windows_11_23h2"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_11_25h2"},{"vendor":"microsoft","product":"windows_11_26h1"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42915","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42915"},{"url":"https://github.com/advisories/GHSA-3pg4-4j29-q4rr"}],"sources":{"cve":[{"id":"CVE-2026-42915","title":"Microsoft Windows VMSwitch Denial of Service Vulnerability","description":"Incorrect calculation of buffer size in Windows VMSwitch allows an authorized attacker to deny service locally.","status":"published","published":"2026-06-09T17:06:07.923Z","modified":"2026-11-10T23:24:56.919Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-131"],"updated_at":"2026-11-11T00:50:10.062046Z"}],"euvd":[{"id":"EUVD-2026-35727","description":"Incorrect calculation of buffer size in Windows VMSwitch allows an authorized attacker to deny service locally.","status":"published","published":"2026-06-09T17:06:07Z","modified":"2026-11-10T23:24:56Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-11T00:24:45.332412Z"}],"ghsa":[{"id":"GHSA-3pg4-4j29-q4rr","title":"Incorrect calculation of buffer size in Windows TCP/IP allows an authorized attacker to deny...","description":"Incorrect calculation of buffer size in Windows TCP/IP allows an authorized attacker to deny service over an adjacent network.","status":"published","published":"2026-06-09T18:30:44Z","modified":"2026-06-09T18:30:52Z","cvss":[{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-131"],"updated_at":"2026-11-02T15:08:41.598643Z"}],"nvd":[{"id":"CVE-2026-42915","description":"Incorrect calculation of buffer size in Windows VMSwitch allows an authorized attacker to deny service locally.","status":"published","published":"2026-06-09T17:17:11.78Z","modified":"2026-07-23T08:10:00.137Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-131"],"updated_at":"2026-11-02T14:12:23.109705Z"}]}}