High
Security advisory
.NET Core and Visual Studio Denial of Service Vulnerability
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-26423
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:48 UTC · Revision 1
Source evidence
.NET Core and Visual Studio Denial of Service Vulnerability
osv:CVE-2021-26423
Complete source record
{
"id": "2735de21e947530a06081051fc695fb2ae41b0da3df6da0ab84b5188190fcce4",
"url": "https://osv.dev/vulnerability/CVE-2021-26423",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-26423",
"summary": ".NET Core and Visual Studio Denial of Service Vulnerability",
"evidence": "osv:CVE-2021-26423",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-26423",
"aliases": [
"BIT-dotnet-2021-26423",
"BIT-dotnet-sdk-2021-26423",
"CVE-2021-26423",
"GHSA-rh58-r7jh-xhx3"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/dotnet/core",
"type": "GIT",
"events": [
{
"introduced": "62bcac3998e1168f4a34b775a06d6451b5ffca7b"
},
{
"last_affected": "532b35ca2acfb62e831768ba07401212877ac104"
},
{
"introduced": "5c0a0489d157ca82fca6f9b73c682f118e8c4a8a"
},
{
"last_affected": "532b35ca2acfb62e831768ba07401212877ac104"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.0"
},
{
"last_affected": "5.0.8"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.1"
},
{
"last_affected": "3.1.17"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v5.0.8",
"v3.1.17",
"v6.0.0-preview.5",
"v5.0.7",
"v3.1.16",
"v6.0.0-preview.4",
"v5.0.6",
"v3.1.15",
"v3.1.14",
"v6.0.0-preview.3",
"v5.0.5",
"v6.0.0-preview.2",
"v5.0.4",
"v3.1.13",
"v6.0.0-preview.1",
"v5.0.3",
"v3.1.12",
"v2.1.25",
"v5.0.2",
"v3.1.11",
"v2.1.24",
"v5.0.1",
"v5.0.0",
"v3.1.10"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26423.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/powershell/powershell",
"type": "GIT",
"events": [
{
"introduced": "b54b188c1804d4dcebb09a8be3a67916abd94fd7"
},
{
"fixed": "6e5e7f595fb4c33150679ebb4d13ba5e1f682e76"
},
{
"introduced": "fa01333bfeef5dd7769143e2b4ec7ffdb70c62c8"
},
{
"fixed": "3e91b1e4e0cd12f3742c3f0265aecf68dd13f969"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "7.0"
},
{
"fixed": "7.0.7"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "7.1"
},
{
"fixed": "7.1.4"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v7.0.6",
"v7.1.3",
"v7.0.5",
"v7.1.2",
"v7.0.4",
"v7.1.1",
"v7.1.0",
"v7.0.3",
"v7.0.2",
"v7.0.1",
"v7.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26423.json"
}
}
],
"modified": "2026-10-24T10:30:22.223778263Z",
"provider": "osv",
"references": [
"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26423",
"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26423"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*"
],
"vendor_product": "microsoft:.net_core",
"extracted_events": [
{
"range": [
{
"introduced": "2.1"
},
{
"last_affected": "2.1.28"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*"
],
"vendor_product": "microsoft:visual_studio_2017",
"extracted_events": [
{
"range": [
{
"introduced": "15.0"
},
{
"last_affected": "15.9"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*"
],
"vendor_product": "microsoft:visual_studio_2019",
"extracted_events": [
{
"range": [
{
"introduced": "16.0"
},
{
"last_affected": "16.10"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:visual_studio_2019:8.10:*:*:*:*:macos:*:*"
],
"vendor_product": "microsoft:visual_studio_2019",
"extracted_events": [
{
"range": [
{
"introduced": "8.10"
},
{
"last_affected": "8.10"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-26423",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 430627,
"published_at": "2021-08-12T18:15:08.537+00:00"
}