HIGH 8.2 Microsoft PoC

CVE-2024-27983

An attacker can make the Node.js HTTP/2 server completely unavailable by sending a small amount of HTTP/2 frames packets with a few HTTP/2 frames inside. It is possible to leave some data in nghttp2 memory after reset when headers with HTTP/2 CONTINUATION frame are sent to the server and then a TCP connection is abruptly closed by the client triggering the Http2Session destructor while header frames are still being processed (and stored in memory) causing a race condition.

Microsoft Security Update 2024-Apr: An attacker can make the Node.js HTTP/2 server completely unavailable by sending a small amount of HTTP/2 frames packets with a few HTTP/2 frames inside. It is possible to leave some data in nghttp2 memory after reset when headers with HTTP/2 CONTINUATION frame are sent to the server and then a TCP connection is abruptly closed by the client triggering the Http2Session destructor while header frames are still being processed (and stored in memory) causing a race condition.

Affected Products

References

Published: 2024-04-09 · Source: Microsoft · Feed updated: 2026-08-04
This high severity vulnerability with a CVSS score of 8.2 was published on 2024-04-09 via Microsoft. 🚨 A public proof-of-concept exploit is available on GitHub. EPSS score: 87.2% (top 0% of all CVEs by exploitation probability). Affected: azl3 nodejs 20.14.0-1 on Azure Linux 3.0, azl3 nodejs 20.10.0-2 on Azure Linux 3.0, cbl2 nodejs18 18.18.2-7 on CBL Mariner 2.0.
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