CVE-2026-25667

7.5 highEPSS 3.1%

High (7.5) in microsoft .net. EPSS 3.1% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 3.1% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-10-31)
CWE: CWE-400
Published: 2026-03-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

microsoft:.net

References

https://github.com/IsaJafarov/Kestrel-DoS
https://github.com/IsaJafarov/Q3Fuzz
https://github.com/dotnet/aspnetcore/commit/96ccc40a0e095424b19506e8268b9b1a3e23d6a7#diff-667d5b3693f93a0f706ab211428998b210862f9b885d917104d2013118312626

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