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CVE-2026-25667

HIGHCVSS 7.5/10EPSS 3.00%

Last modified

CVE-2026-25667 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 3.00% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
3.00%

85.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Microsoft.Net>= 8.0.0, < 8.0.22
Microsoft.Net>= 9.0.0, < 9.0.11

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2026-25667?
CVE-2026-25667 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.00% probability of exploitation in the next 30 days.
How do I fix CVE-2026-25667?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-25667?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST