CVE-2024-27983 is classified as a high-severity vulnerability with a CVSS score of 8.2. This vulnerability allows an attacker to make the Node.js HTTP/2 server completely unavailable. By sending a small number of HTTP/2 frames packets, the attacker can exploit a race condition that occurs when the TCP connection is abruptly closed by the client. This situation leaves some data in the nghttp2 memory after a reset, resulting in a denial-of-service (DoS) condition. The urgency for organizations to address this vulnerability is high, as it can severely impact server availability.
The vulnerability involves sending headers with HTTP/2 CONTINUATION frames to the server, which are processed and stored in memory. If a TCP connection is closed during this process, it triggers the Http2Session destructor, leading to potential instability and server downtime. Organizations must prioritize patching to prevent exploitation, especially given the high exploitability rating of this vulnerability.
As of now, there is a known exploit for this vulnerability, and it is important for security teams to monitor their environments for any signs of exploitation. The potential impact on organizations includes significant loss of service availability, which can affect customer trust and operational continuity.
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