{"id":"CVE-2026-23666","title":".NET Framework Denial of Service Vulnerability","summary":"Improper input validation in .NET Framework 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/E:P/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-755"],"vendor":"Microsoft","product":"Microsoft .NET Framework 3.5","affected":[".net_framework_3.5 >= 3.5.0 < 2.0.50727.8982 & 3.0.30729.8976",".net_framework_3.5_and_4.7.2 >= 4.7.0 < 2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0",".net_framework_3.5_and_4.8 >= 4.8.0 < 2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0",".net_framework_3.5_and_4.8.1 >= 4.8.1 < 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0",".net_framework_4.6.2_4.7_4.7.1_4.7.2 >= 4.7.0 < 4.8.4801.0",".net_framework_4.8 >= 4.8.0 < 4.8.4801.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-04-15T13:40:59.739058Z"},"published":"2026-04-14","updated":"2026-09-25","sourceUpdated":"2026-09-25T17:25:37.542Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23666","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666","label":".NET Framework Denial of Service Vulnerability"}],"tags":["cve.org"],"epss":0.0133,"epssPercentile":0.6982,"ingestedAt":"2026-09-25T18:14:20.437Z","slug":"CVE-2026-23666","body":"## Overview\n\nImproper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.\n\n## Affected\n\n- `.net_framework_3.5 >= 3.5.0 < 2.0.50727.8982 & 3.0.30729.8976`\n- `.net_framework_3.5_and_4.7.2 >= 4.7.0 < 2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0`\n- `.net_framework_3.5_and_4.8 >= 4.8.0 < 2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0`\n- `.net_framework_3.5_and_4.8.1 >= 4.8.1 < 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0`\n- `.net_framework_4.6.2_4.7_4.7.1_4.7.2 >= 4.7.0 < 4.8.4801.0`\n- `.net_framework_4.8 >= 4.8.0 < 4.8.4801.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}