Concurrent execution using shared resource with improper synchronization ('race condition') in .NET Framework allows an unauthorized attacker to deny service over a network.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Microsoft Microsoft .NET Framework 3.5 affected
Version Status Constraints
3.5.0 affected < 2.0.50727.8982 & 3.0.30729.8976
Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 affected
Version Status Constraints
4.7.0 affected < 2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0
Microsoft Microsoft .NET Framework 3.5 AND 4.8 affected
Version Status Constraints
4.8.0 affected < 2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0
Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 affected
Version Status Constraints
4.8.1 affected < 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0
Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 affected
Version Status Constraints
4.7.0 affected < 4.8.4801.0
Microsoft Microsoft .NET Framework 4.8 affected
Version Status Constraints
4.8.0 affected < 4.8.4801.0

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Microsoft Subscribe
.net Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666 cve-icon cve-icon
History

Tue, 14 Apr 2026 17:30:00 +0000

Type Values Removed Values Added
Description Concurrent execution using shared resource with improper synchronization ('race condition') in .NET Framework allows an unauthorized attacker to deny service over a network.
Title .NET Framework Denial of Service Vulnerability
First Time appeared Microsoft
Microsoft .net
Weaknesses CWE-755
CPEs cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft .net
References
Metrics cvssV3_1

{'score': 7.5, 'vector': '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'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-04-14T16:57:53.069Z

Reserved: 2026-01-14T16:59:33.464Z

Link: CVE-2026-23666

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-14T18:16:44.507

Modified: 2026-04-14T18:16:44.507

Link: CVE-2026-23666

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses