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CVE-2025-8671: HTTP/2 Denial-of-Service Vulnerability through Client-Triggered Server-Sent Stream Resets

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Overview

The CVE-2025-8671 vulnerability pertains to a mismatch issue between HTTP/2 specifications and internal architectures of some HTTP/2 implementations. This flaw, affecting a wide range of web services and applications relying on HTTP/2, can lead to significant server resource consumption, potentially resulting in a denial of service (DoS) attack. Addressing this vulnerability is critical to maintain the availability and reliability of affected systems.

Vulnerability Summary

CVE ID: CVE-2025-8671
Severity: High (7.5 CVSS v3)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage due to excessive server resource consumption leading to DoS.

Affected Products

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Product | Affected Versions

[Product 1] | [All versions prior to patch release]
[Product 2] | [All versions prior to patch release]

How the Exploit Works

An attacker can exploit this vulnerability by opening streams and then rapidly triggering the server to reset them-using malformed frames or flow control errors. The incorrect stream accounting allows a client to cause the server to handle an unbounded number of concurrent streams on a single connection, leading to excessive server resource consumption and potentially causing a DoS.

Conceptual Example Code

An attacker might exploit the vulnerability through a series of HTTP/2 requests in the following conceptual manner:

:method: POST
:scheme: https
:path: /vulnerable/endpoint
:authority: target.example.com
content-type: application/http2
{ "malicious_payload": "trigger rapid stream reset" }

This payload triggers the server to reset the stream, causing it to handle an unbounded number of concurrent streams, leading to potential DoS.

Recommendations

To mitigate this vulnerability, affected products should apply the vendor patch as soon as it is available. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. Regular monitoring of network traffic for signs of exploitation is also advised until a permanent solution is implemented.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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