CyberRota Analysis
AI-GeneratedThe h2o HTTP server is vulnerable to a denial-of-service attack due to improper handling of a zero-length Server Name Indication (SNI) extension in ClientHello messages over TLS or QUIC, which can lead to segmentation violations. This issue affects all versions prior to the fix implemented in commit 8dc37cb. Organizations using h2o should prioritize applying the update to mitigate potential service disruptions.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it is NULL-terminated. This is a potential denial-of-service attack vector in sense that it might trigger segmentation violation. This issue has been fixed by commit 8dc37cb.
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