{"id":"CVE-2026-88240","aliases":["EUVD-2026-121731","GHSA-m4pm-mp45-4j95"],"status":"published","title":"Windows DHCP Client Elevation of Privilege Vulnerability","description":"Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.","severity":{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-14","score":0.0044,"percentile":0.38758,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122"],"published":"2026-11-10T18:16:58Z","modified":"2026-11-10T21:34:07Z","products":[{"vendor":"microsoft","product":"windows 10 version 1607"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"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 11 version 26h2"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88240","tags":["vendor-advisory","patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88240"},{"url":"https://github.com/advisories/GHSA-m4pm-mp45-4j95"}],"sources":{"cve":[{"id":"CVE-2026-88240","title":"Windows DHCP Client Elevation of Privilege Vulnerability","description":"Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.","status":"published","published":"2026-11-10T18:16:58.621Z","modified":"2026-11-13T18:05:49.212Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-10T19:39:59.74912Z"}],"euvd":[{"id":"EUVD-2026-121731","description":"Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.","status":"published","published":"2026-11-10T18:16:58Z","modified":"2026-11-13T18:05:49Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-11T00:25:04.513391Z"}],"ghsa":[{"id":"GHSA-m4pm-mp45-4j95","title":"Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate...","description":"Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.","status":"published","published":"2026-11-10T21:34:00Z","modified":"2026-11-10T21:34:07Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-122"],"updated_at":"2026-11-10T21:57:56.197754Z"}],"nvd":[{"id":"CVE-2026-88240","description":"Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.","status":"published","published":"2026-11-10T19:21:33.217Z","modified":"2026-11-11T12:19:59.76Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-122"],"updated_at":"2026-11-11T14:25:06.730463Z"}]}}