CVE-2025-8671

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 themusing malformed frames or flow control errorsan 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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
certccCNA
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CISA-ADPADP
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVEADP
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Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 25%
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Debian Releases
Debian Product
Codename
h2o
bullseye
ignored
bookworm
ignored
haproxy
bullseye
2.2.9-2+deb11u6
ignored
bookworm
2.6.12-1+deb12u2
ignored
bullseye (security)
2.2.9-2+deb11u7
fixed
bookworm (security)
2.6.12-1+deb12u1
fixed
forky
3.0.11-1
fixed
trixie
3.0.11-1
fixed
sid
3.2.5-1
fixed
varnish
bullseye
ignored
bookworm
ignored
bullseye (security)
vulnerable
bookworm (security)
vulnerable
trixie
vulnerable
forky
7.7.3-1
fixed
sid
7.7.3-1
fixed