# CVE-2025-8671: CVE-2025-8671

> CVE-2025-8671: CVE-2025-8671. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-8671
Last updated: 2026-06-17T10:07:24Z

- Published: 2025-08-13 12:03 UTC · Updated: 2026-06-17 10:07 UTC · Assigner: certcc
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 3.6%, 89th percentile (scored 2026-10-25)
- CISA KEV: no

## 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.

## Affected vendors and products

- Fastly: H20
- SUSE Linux: Enterprise Desktop
- SUSE Linux: Enterprise High Performance Computing
- SUSE Linux: Enterprise High Performance Computing (HPC)
- SUSE Linux: Enterprise Module for Development Tools
- 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: openSUSE Leap
- SUSE Linux: SUSE Manager Proxy
- SUSE Linux: SUSE Manager Retail Branch Server
- SUSE Linux: SUSE Manager Server
- SUSE Linux: SUSE Manager Server LTS
- Varnish Software: Varnish Cache
- Varnish Software: Varnish Enterprise
- Wind River: Linux

## Tracked companies

- [Fastly](https://rewindex.com/company/fastly.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-8671)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-8671)
- [https://galbarnahum.com/made-you-reset](https://galbarnahum.com/made-you-reset)
- [https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80](https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80)
- [https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq](https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq)
- [https://gitlab.isc.org/isc-projects/bind9/-/issues/5325](https://gitlab.isc.org/isc-projects/bind9/-/issues/5325)
- [https://kb.cert.org/vuls/id/767506](https://kb.cert.org/vuls/id/767506)
- [https://support2.windriver.com/index.php?page=security-notices](https://support2.windriver.com/index.php?page=security-notices)
- [https://varnish-cache.org/security/VSV00017.html](https://varnish-cache.org/security/VSV00017.html)
- [https://www.fastlystatus.com/incident/377810](https://www.fastlystatus.com/incident/377810)
- [https://www.suse.com/support/kb/doc/?id=000021980](https://www.suse.com/support/kb/doc/?id=000021980)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-8671 · Markdown: https://rewindex.com/cve/CVE-2025-8671.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-8671 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:18.302Z