CVE-2026-25667 Details
Description
ASP.NET Core Kestrel in Microsoft .NET 8.0 before 8.0.22 and .NET 9.0 before 9.0.11 allows a remote attacker to cause excessive CPU consumption by sending a crafted QUIC packet, because of an incorrect exit condition for HTTP/3 Encoder/Decoder stream processing.
A denial-of-service vulnerability has been identified in ASP.NET Core Kestrel, affecting Microsoft .NET versions 8.0 prior to 8.0.22 and 9.0 prior to 9.0.11. The issue allows remote attackers to cause significant CPU usage by sending specially crafted QUIC packets. This is due to an incorrect exit condition in the HTTP/3 encoder and decoder stream processing, which can lead to server paralysis.
Users can upgrade to .NET 8.0.22 or .NET 9.0.11, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 24, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| microsoft .net | >= 8.0.0, < 8.0.22 >= 9.0.0, < 9.0.11 |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 22, 2026 | CVE Modified | [email protected] |
| Apr 14, 2026 | Initial Analysis | [email protected] |
| Mar 24, 2026 | CVE Modified | CISA-ADP |
| Mar 19, 2026 | New CVE Received | [email protected] |