CVE-2025-8671

EUVD-2025-24560
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
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
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
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 38%
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Debian Releases
Debian Product
Codename
h2o
bookworm
ignored
bullseye
ignored
trixie
no-dsa
haproxy
bookworm
2.6.12-1+deb12u3
ignored
bookworm (security)
2.6.12-1+deb12u3
fixed
bullseye
2.2.9-2+deb11u6
ignored
bullseye (security)
2.2.9-2+deb11u7
fixed
forky
3.2.12-1
fixed
sid
3.2.13-1
fixed
trixie
3.0.11-1+deb13u1
no-dsa
trixie (security)
3.0.11-1+deb13u2
fixed
varnish
bookworm
ignored
bookworm (security)
vulnerable
bullseye
ignored
bullseye (security)
vulnerable
forky
7.7.3-1
fixed
sid
7.7.3-1
fixed
trixie
no-dsa