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HighASP.NET

CVE-2026-25667

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.

CVSS Base Score
7.5

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

Exploit Probability
91%EPSS PERCENTILE0100

More exploitable than 91% of all CVEs · Top 9%

2%

of the sites UNPWNED scans run ASP.NET, the technology this CVE affects. Version determines exposure, so scan yours to know for sure.Aggregate across 727 scanned sites. No site is identified.

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Details
Published
2026-03-19
Last modified
2026-04-14
Affected
ASP.NET
References
NVD Detail OSV.dev GitHub Advisories

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Data from the National Vulnerability Database (NVD), CISA KEV, and FIRST.org EPSS. This product uses the NVD API but is not endorsed or certified by the NVD. EPSS is a probability estimate, not a guarantee of exploitation.