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CVE-2025-8671

7.5 · HIGH

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 c…

Published Aug 13, 2025CWE-404EPSS 3.62%

Overview

CVE-2025-8671 is a high-severity vulnerability. It was published on August 13, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgalbarnahum.com/made-you-resetGitHubgithub.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80GitHubgithub.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjqRefgitlab.isc.org/isc-projects/bind9/-/issues/5325Refkb.cert.org/vuls/id/767506Refsupport2.windriver.com/index.php?page=security-noticesRefvarnish-cache.org/security/VSV00017.htmlRefwww.fastlystatus.com/incident/377810Refwww.suse.com/support/kb/doc/?id=000021980Refwww.openwall.com/lists/oss-security/2025/08/13/6

How CyberStrike helps

Frequently asked questions

What is CVE-2025-8671?

CVE-2025-8671 is a high-severity vulnerability. It was published on August 13, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-8671?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-8671?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-8671?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-8671 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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