CyberRota Analysis
AI-GeneratedThe vulnerability affects the Quicly implementation of the QUIC protocol, primarily used in the H2O HTTP server, allowing an adversarial peer to exploit flow control mechanisms to cause excessive memory allocation. This can lead to Denial of Service through memory exhaustion, particularly under default configurations where memory usage per connection can increase significantly. Organizations utilizing the H2O HTTP server or similar implementations should prioritize applying the fix 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
Quicly is an IETF QUIC protocol implementation intended primarily for use within the H2O HTTP server. Prior to commit 8b178e6, an adversarial peer could send a STREAM frame carrying just one byte at the largest offset being permitted to obtain additional flow control credit, which under certain circumstances could lead to a Denial of Service. Assuming the application prepares a receive buffer for storing all data that arrive out-of-order, up to the largest offset being received, this behavior could lead to the application allocating large amount of memory with the peer sending only a handful of packets, resulting in memory exhaustion. In addition to the receive buffer allocation strategy, the severity of this vulnerability depends on how the application controls the stream concurrency. In case of the H2O HTTP server, under its default setting, this bug increases the maximum amount of memory allocated per connection by about 4 times. This issue has been fixed by commit 8b178e6.
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