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Fencer Vulns
high 7.5

CVE-2025-8671 json

CVE-2025-8671

published 2025-08-13 14 mo ago modified 2026-06-17 4 mo ago also GHSA-mrjm-qq9m-9mjq , RUSTSEC-2025-0070 , EUVD-2025-24560

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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.

Patch / fix

  • crates.io pingora-core 0.6.0
  • SUSE Linux Enterprise Module for Development Tools 15-SP5
  • SUSE Linux Enterprise High Performance Computing (HPC) 15 SP5
  • SUSE Linux Enterprise Desktop 15 SP7
  • SUSE Linux Enterprise High Performance Computing 15 SP7
  • SUSE Linux Enterprise Module for Dev Tools 15 SP7
  • SUSE Linux Enterprise Module for Package Hub 15 SP7
  • SUSE Linux Enterprise Server 15 SP7
  • SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • varnish Debian 13 7.7.0-3+deb13u1

debian advisories DEBIAN-CVE-2025-8671

  • dnsdist Ubuntu 25.10 1.9.10-1ubuntu0.1
  • dnsdist Ubuntu Pro 24.04 LTS 1.8.3-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2025-8671

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dnsdist SLES for SAP applications 16.0, SLES 16.0 1.9.11-160000.1.1
  • dnsdist SLE Module for Basesystem 15 SP7 1.9.11-150700.3.6.1

suse advisories SUSE-SU-2026:20995-1SUSE-SU-2026:0888-1

  • bun openSUSE Tumbleweed 1.4.4-1.1
  • varnish openSUSE Leap 16.0 7.7.3-bp160.1.1
  • dnsdist openSUSE Leap 16.0 1.9.11-160000.1.1
  • dnsdist openSUSE Tumbleweed 2.0.2-1.1
  • lighttpd openSUSE Tumbleweed 1.4.80-1.1

opensuse advisories openSUSE-SU-2026:12316-1openSUSE-SU-2026:22131-1openSUSE-SU-2026:20461-1openSUSE-SU-2026:10219-1openSUSE-SU-2025:15448-1

  • dnsdist Alpine 3.24, Alpine 3.23 2.0.1-r0
  • varnish Alpine 3.24, Alpine 3.23, Alpine 3.22 7.7.2-r0
  • lighttpd Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 0-r0

alpine advisories ALPINE-CVE-2025-8671

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-8671 updated

upstream:

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
14 mo ago

Exploit prediction

3.64% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.isc.org https://gitlab.isc.org/isc-projects/bind9/-/issues/5325 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
crates.io pingora-core
>=0.0.0-0, <0.6.0
0.6.0

Affected products

  • SUSE Linux Enterprise Module for Development Tools
  • SUSE Linux Enterprise High Performance Computing (HPC)
  • Varnish Software Varnish Enterprise
  • Varnish Software Varnish Cache
  • Fastly H20
  • Wind River Linux
  • SUSE Linux Enterprise Desktop
  • SUSE Linux Enterprise High Performance Computing
  • SUSE Linux Enterprise Module for Dev Tools
  • SUSE Linux Enterprise Module for Package Hub
  • SUSE Linux Enterprise Server
  • SUSE Linux Enterprise Server for SAP Applications
  • SUSE Linux SUSE Manager Server
  • SUSE Linux SUSE Manager Server LTS
  • SUSE Linux SUSE Manager Proxy
  • SUSE Linux SUSE Manager Retail Branch Server
  • SUSE Linux openSUSE Leap

Classification

Weakness
  • CWE-404 Improper Resource Shutdown or Release

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.