CVE-2026-23666 (GCVE-0-2026-23666)
Vulnerability from cvelistv5 – Published: 2026-04-14 16:57 – Updated: 2026-04-30 14:41
VLAI?
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 ?
CWE
- CWE-755 - Improper Handling of Exceptional Conditions
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft .NET Framework 3.5 |
Affected:
3.5.0 , < 2.0.50727.8982 & 3.0.30729.8976
(custom)
|
|||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||
Date Public ?
2026-04-14 14:00
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-23666",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-15T13:40:59.739058Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T13:41:08.655Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"platforms": [
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.8982 \u0026 3.0.30729.8976",
"status": "affected",
"version": "3.5.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems"
],
"product": "Microsoft .NET Framework 3.5 AND 4.7.2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0",
"status": "affected",
"version": "4.7.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 21H2 for 32-bit Systems",
"Windows 10 Version 21H2 for ARM64-based Systems",
"Windows 10 Version 21H2 for x64-based Systems",
"Windows 10 Version 22H2 for 32-bit Systems",
"Windows 10 Version 22H2 for ARM64-based Systems",
"Windows 10 Version 22H2 for x64-based Systems",
"Windows Server 2022",
"Windows Server 2022 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5 AND 4.8",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0",
"status": "affected",
"version": "4.8.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 21H2 for 32-bit Systems",
"Windows 10 Version 21H2 for ARM64-based Systems",
"Windows 10 Version 21H2 for x64-based Systems",
"Windows 10 Version 22H2 for 32-bit Systems",
"Windows 10 Version 22H2 for ARM64-based Systems",
"Windows 10 Version 22H2 for x64-based Systems",
"Windows 11 Version 22H2 for ARM64-based Systems",
"Windows 11 Version 22H2 for x64-based Systems",
"Windows 11 Version 23H2 for ARM64-based Systems",
"Windows 11 Version 23H2 for x64-based Systems",
"Windows 11 Version 24H2 for ARM64-based Systems",
"Windows 11 Version 24H2 for x64-based Systems",
"Windows 11 Version 25H2 for ARM64-based Systems",
"Windows 11 Version 25H2 for x64-based Systems",
"Windows 11 Version 26H1 for ARM64-based Systems",
"Windows 11 version 26H1 for x64-based Systems",
"Windows Server 2022",
"Windows Server 2022 (Server Core installation)",
"Windows Server 2022, 23H2 Edition (Server Core installation)",
"Windows Server 2025",
"Windows Server 2025 (Server Core installation)"
],
"product": "Microsoft .NET Framework 3.5 AND 4.8.1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0",
"status": "affected",
"version": "4.8.1",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "4.8.4801.0",
"status": "affected",
"version": "4.7.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows Server 2012",
"Windows Server 2012 (Server Core installation)",
"Windows Server 2012 R2",
"Windows Server 2012 R2 (Server Core installation)"
],
"product": "Microsoft .NET Framework 4.8",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "4.8.4801.0",
"status": "affected",
"version": "4.8.0",
"versionType": "custom"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.8.4801.0",
"versionStartIncluding": "4.8.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0",
"versionStartIncluding": "4.8.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0",
"versionStartIncluding": "4.7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.8.4801.0",
"versionStartIncluding": "4.7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0",
"versionStartIncluding": "4.8.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.0.50727.8982 \u0026 3.0.30729.8976",
"versionStartIncluding": "3.5.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"datePublic": "2026-04-14T14:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "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",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-755",
"description": "CWE-755: Improper Handling of Exceptional Conditions",
"lang": "en-US",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-30T14:41:48.509Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"name": ".NET Framework Denial of Service Vulnerability",
"tags": [
"vendor-advisory",
"patch"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666"
}
],
"title": ".NET Framework Denial of Service Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2026-23666",
"datePublished": "2026-04-14T16:57:53.069Z",
"dateReserved": "2026-01-14T16:59:33.464Z",
"dateUpdated": "2026-04-30T14:41:48.509Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-23666",
"date": "2026-05-08",
"epss": "0.00117",
"percentile": "0.30013"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-23666\",\"sourceIdentifier\":\"secure@microsoft.com\",\"published\":\"2026-04-14T18:16:44.507\",\"lastModified\":\"2026-05-07T19:46:16.750\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-755\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"23317443-1968-4791-9F20-AD3B308A83D1\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A7DF96F8-BA6A-4780-9CA3-F719B3F81074\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DB18C4CE-5917-401E-ACF7-2747084FD36E\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"23317443-1968-4791-9F20-AD3B308A83D1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"3EF7A75E-EE27-4AA7-8D84-9D696728A4CE\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"73D24713-D897-408D-893B-77A61982597D\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"306B7CE6-8239-4AED-9ED4-4C9F5B349F58\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x86:*\",\"matchCriteriaId\":\"345FCD64-D37B-425B-B64C-8B1640B7E850\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"23317443-1968-4791-9F20-AD3B308A83D1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"2D3F18AF-84ED-473B-A8DF-65EB23C475AF\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"73D24713-D897-408D-893B-77A61982597D\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"306B7CE6-8239-4AED-9ED4-4C9F5B349F58\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x86:*\",\"matchCriteriaId\":\"345FCD64-D37B-425B-B64C-8B1640B7E850\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"8FC46499-DB6E-48BF-9334-85EE27AFE7AF\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"83A79DD6-E74E-419F-93F1-323B68502633\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x86:*\",\"matchCriteriaId\":\"61959ACC-B608-4556-92AF-4D94B338907A\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"A9D54EE6-30AF-411C-A285-A4DCB6C6EC06\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"C230D3BF-7FCE-405C-B62E-B9190C995C3C\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x86:*\",\"matchCriteriaId\":\"1FD62DCB-66D1-4CEA-828E-0BD302AC63CA\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"821614DD-37DD-44E2-A8A4-FE8D23A33C3C\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"23317443-1968-4791-9F20-AD3B308A83D1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:4.8.1:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"934D4E46-12C1-41DC-A28C-A2C430E965E4\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"8FC46499-DB6E-48BF-9334-85EE27AFE7AF\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"83A79DD6-E74E-419F-93F1-323B68502633\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x86:*\",\"matchCriteriaId\":\"61959ACC-B608-4556-92AF-4D94B338907A\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"A9D54EE6-30AF-411C-A285-A4DCB6C6EC06\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"C230D3BF-7FCE-405C-B62E-B9190C995C3C\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x86:*\",\"matchCriteriaId\":\"1FD62DCB-66D1-4CEA-828E-0BD302AC63CA\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_11_22h2:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"B2D24C54-F04F-4717-B614-FE67B3ED9DC0\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_11_22h2:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"D5EC3F68-8F41-4F6B-B2E5-920322A4A321\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_11_23h2:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"B0301BA0-81DB-4FC1-9BC3-EB48A56BC608\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_11_23h2:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"8E3C1327-F331-4448-A253-00EAC7428317\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_11_24h2:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"08EE1F3A-A8DE-4867-BB5B-8A8ED867F3CA\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_11_24h2:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"B1670829-6A8C-4688-B7A5-3DFB878A4861\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_11_25h2:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"024EE6EC-6D62-4EAC-B1EF-A5E4EAD439A1\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_11_25h2:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"25D142AB-B61D-43F3-B7E6-DB9140EFEF75\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_11_26h1:-:*:*:*:*:*:arm64:*\",\"matchCriteriaId\":\"CBFE0371-0C4D-406A-9EC7-456104271C3E\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_11_26h1:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"F2B83840-FCE8-445A-AE55-ACEDA6534FA1\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"821614DD-37DD-44E2-A8A4-FE8D23A33C3C\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_server_2022_23h2:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"FBF3E8E3-BC4A-4CBA-8859-0AB6393E8A40\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_server_2025:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"FE97605F-7942-435A-9F5B-D51FA19A41AD\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A16AD2B0-2189-4E8E-B7FC-CE598CA1CB2D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:4.7:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"734112B3-1383-4BE3-8721-C0F84566B764\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:4.7.1:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"36B0E40A-84EF-4099-A395-75D6B8CDA196\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"3EF7A75E-EE27-4AA7-8D84-9D696728A4CE\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A7DF96F8-BA6A-4780-9CA3-F719B3F81074\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DB18C4CE-5917-401E-ACF7-2747084FD36E\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"2D3F18AF-84ED-473B-A8DF-65EB23C475AF\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"5E491E46-1917-41FE-8F9A-BB0BDDEB42C3\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x86:*\",\"matchCriteriaId\":\"0A1BC97A-263E-4291-8AEF-02EE4E6031E9\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A7DF96F8-BA6A-4780-9CA3-F719B3F81074\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DB18C4CE-5917-401E-ACF7-2747084FD36E\"}]}]}],\"references\":[{\"url\":\"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666\",\"source\":\"secure@microsoft.com\",\"tags\":[\"Vendor Advisory\"]}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-23666\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-15T13:40:59.739058Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-15T13:41:03.726Z\"}}], \"cna\": {\"title\": \".NET Framework Denial of Service Vulnerability\", \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"vectorString\": \"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\"}, \"scenarios\": [{\"lang\": \"en-US\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 3.5\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.5.0\", \"lessThan\": \"2.0.50727.8982 \u0026 3.0.30729.8976\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows Server 2012\", \"Windows Server 2012 (Server Core installation)\", \"Windows Server 2012 R2\", \"Windows Server 2012 R2 (Server Core installation)\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 3.5 AND 4.7.2\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.7.0\", \"lessThan\": \"2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows 10 Version 1809 for 32-bit Systems\", \"Windows 10 Version 1809 for ARM64-based Systems\", \"Windows 10 Version 1809 for x64-based Systems\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 3.5 AND 4.8\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8.0\", \"lessThan\": \"2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows 10 Version 1809 for 32-bit Systems\", \"Windows 10 Version 1809 for ARM64-based Systems\", \"Windows 10 Version 1809 for x64-based Systems\", \"Windows 10 Version 21H2 for 32-bit Systems\", \"Windows 10 Version 21H2 for ARM64-based Systems\", \"Windows 10 Version 21H2 for x64-based Systems\", \"Windows 10 Version 22H2 for 32-bit Systems\", \"Windows 10 Version 22H2 for ARM64-based Systems\", \"Windows 10 Version 22H2 for x64-based Systems\", \"Windows Server 2022\", \"Windows Server 2022 (Server Core installation)\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 3.5 AND 4.8.1\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8.1\", \"lessThan\": \"2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows 10 Version 21H2 for 32-bit Systems\", \"Windows 10 Version 21H2 for ARM64-based Systems\", \"Windows 10 Version 21H2 for x64-based Systems\", \"Windows 10 Version 22H2 for 32-bit Systems\", \"Windows 10 Version 22H2 for ARM64-based Systems\", \"Windows 10 Version 22H2 for x64-based Systems\", \"Windows 11 Version 22H2 for ARM64-based Systems\", \"Windows 11 Version 22H2 for x64-based Systems\", \"Windows 11 Version 23H2 for ARM64-based Systems\", \"Windows 11 Version 23H2 for x64-based Systems\", \"Windows 11 Version 24H2 for ARM64-based Systems\", \"Windows 11 Version 24H2 for x64-based Systems\", \"Windows 11 Version 25H2 for ARM64-based Systems\", \"Windows 11 Version 25H2 for x64-based Systems\", \"Windows 11 Version 26H1 for ARM64-based Systems\", \"Windows 11 version 26H1 for x64-based Systems\", \"Windows Server 2022\", \"Windows Server 2022 (Server Core installation)\", \"Windows Server 2022, 23H2 Edition (Server Core installation)\", \"Windows Server 2025\", \"Windows Server 2025 (Server Core installation)\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.7.0\", \"lessThan\": \"4.8.4801.0\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows Server 2012\", \"Windows Server 2012 (Server Core installation)\", \"Windows Server 2012 R2\", \"Windows Server 2012 R2 (Server Core installation)\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft .NET Framework 4.8\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8.0\", \"lessThan\": \"4.8.4801.0\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows 10 Version 1607 for 32-bit Systems\", \"Windows 10 Version 1607 for x64-based Systems\", \"Windows Server 2012\", \"Windows Server 2012 (Server Core installation)\", \"Windows Server 2012 R2\", \"Windows Server 2012 R2 (Server Core installation)\"]}], \"datePublic\": \"2026-04-14T14:00:00.000Z\", \"references\": [{\"url\": \"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666\", \"name\": \".NET Framework Denial of Service Vulnerability\", \"tags\": [\"vendor-advisory\", \"patch\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"CWE\", \"cweId\": \"CWE-755\", \"description\": \"CWE-755: Improper Handling of Exceptional Conditions\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.8.4801.0\", \"versionStartIncluding\": \"4.8.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.8.4801.0\", \"versionStartIncluding\": \"4.8.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.0.50727.9068 \u0026 3.0.30729.9065 \u0026 4.7.4141.0\", \"versionStartIncluding\": \"4.7.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.8.4801.0\", \"versionStartIncluding\": \"4.7.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.0.50727.9181 \u0026 3.0.30729.9165 \u0026 4.8.9332.0\", \"versionStartIncluding\": \"4.8.1\"}, {\"criteria\": \"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.0.50727.8982 \u0026 3.0.30729.8976\", \"versionStartIncluding\": \"3.5.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2026-04-30T14:41:48.509Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-23666\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-30T14:41:48.509Z\", \"dateReserved\": \"2026-01-14T16:59:33.464Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2026-04-14T16:57:53.069Z\", \"assignerShortName\": \"microsoft\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…