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CVE-2025-8671

CVE-2025-8671

Published: Aug 13, 2025Updated: Nov 4, 2025 Sources: CVE List NVD BDUCWE-404

Description

A mismatch caused by client-triggered server-sent stream resets between HTTP/2 specifications and the internal architectures of some HTTP/2 implementations may result in excessive server resource consumption leading to denial-of-service (DoS). By opening streams and then rapidly triggering the server to reset them—using malformed frames or flow control errors—an attacker can exploit incorrect stream accounting. Streams reset by the server are considered closed at the protocol level, even though backend processing continues. This allows a client to cause the server to handle an unbounded number of concurrent streams on a single connection. This CVE will be updated as affected product details are released.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High

Weaknesses

Affected Products

suse linuxcommercialDEOperating Systemsaka opensuse, suse
varnish softwarecommercialNetworking Infrastructureaka varnish-cache, varnishproject, varnish cache by varnish software
fastlycommercialUSCloud & SaaSaka fastly.com
and 13 more affected products View all →

Exploitability

Official Patch Available

References

and 17 more references View all →

Timeline

Published
Aug 13, 2025
Last Updated
Nov 4, 2025

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