{"id":"CVE-2026-77499","title":"Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an unauthorized attacker to deny service over a network.","summary":"Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an unauthorized attacker to deny service over a network.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-843"],"vendor":"microsoft","product":"windows_10_1607","affected":["windows_10_1607 < 10.0.14393.9512","windows_10_1809 < 10.0.17763.9245","windows_server_2012","windows_server_2012 = r2","windows_server_2016 < 10.0.14393.9512","windows_server_2019 < 10.0.17763.9245","windows_server_2022 < 10.0.20348.5622","windows_server_2025 < 10.0.26100.33438"],"patched":["windows_10_1607 10.0.14393.9512","windows_10_1809 10.0.17763.9245","windows_server_2016 10.0.14393.9512","windows_server_2019 10.0.17763.9245","windows_server_2022 10.0.20348.5622","windows_server_2025 10.0.26100.33438"],"published":"2026-09-08","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:10:18.860","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77499","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77499","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"epss":0.00853,"epssPercentile":0.56289,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-08T18:56:04.352068Z"},"ingestedAt":"2026-09-08T19:08:49.627Z","slug":"CVE-2026-77499","body":"## Overview\n\nAccess of resource using incompatible type ('type confusion') in Windows DHCP Server allows an unauthorized attacker to deny service over a network.\n\n## Affected\n\n- `windows_10_1607 < 10.0.14393.9512`\n- `windows_10_1809 < 10.0.17763.9245`\n- `windows_server_2012`\n- `windows_server_2012 = r2`\n- `windows_server_2016 < 10.0.14393.9512`\n- `windows_server_2019 < 10.0.17763.9245`\n- `windows_server_2022 < 10.0.20348.5622`\n- `windows_server_2025 < 10.0.26100.33438`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_10_1607 10.0.14393.9512`\n- `windows_10_1809 10.0.17763.9245`\n- `windows_server_2016 10.0.14393.9512`\n- `windows_server_2019 10.0.17763.9245`\n- `windows_server_2022 10.0.20348.5622`\n- `windows_server_2025 10.0.26100.33438`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}