CVE-2026-23666High· 7.5▾ TwilightImproper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.3 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 25.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
1.3%
Last analysed / modified upstream
Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.
.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 < 4.8.4801.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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