Denial-of-Service Vulnerability in HTTP/2 Implementations by Wind River

CVE-2025-8671

What is CVE-2025-8671?

CVE-2025-8671 is a denial-of-service (DoS) vulnerability found in HTTP/2 implementations developed by Wind River, impacting various systems that rely on this protocol. HTTP/2 is a critical protocol for web communication, designed to improve performance and efficiency over its predecessor, HTTP/1.1. The vulnerability arises from a mismatch between client-triggered server-sent stream resets and the internal handling of these resets by the affected implementations. Specifically, an attacker can exploit this flaw by rapidly initiating stream resets using malformed frames or flow control errors, leading to excessive resource consumption on the server. This results in a situation where the server becomes overwhelmed, as it incorrectly manages the number of streams, potentially causing it to become unresponsive. The implications of such a vulnerability can severely disrupt business operations, as systems become unable to process legitimate requests, resulting in downtime and loss of service.

Potential impact of CVE-2025-8671

1. Service Downtime: Organizations could experience significant downtime, as the vulnerability enables attackers to exhaust server resources, preventing legitimate users from accessing services.

2. Operational Disruption: The excessive resource consumption may lead to cascading failures, affecting not only the targeted system but potentially disrupting other interconnected services and applications.

3. Increased Operational Costs: Mitigating the effects of a successful exploit may require organizations to allocate additional resources for emergency response, incident management, and potential infrastructure upgrades to handle increased traffic or security measures.

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