CVSS 3.1 Score 3.7 of 10 (low)


Published Dec 12, 2023
Updated: Dec 19, 2023
CWE ID 770


CVE-2023-50247 is a vulnerability affecting the H2O HTTP server versions up to 2.3.0-beta. The vulnerability exists in the QUIC stack (quicly) and can be exploited by a remote attacker when H2O is serving HTTP/3. By exploiting this vulnerability, an attacker can gradually increase the memory retained by the QUIC stack, leading to memory exhaustion and causing H2O to crash. However, this vulnerability does not affect HTTP/1 or HTTP/2 as they do not use QUIC. The issue has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35, but administrators who have not yet upgraded can mitigate the issue by disabling HTTP/3 support. This vulnerability poses a low risk to organizations based on its low base severity score and impact score, and no privileges or user interaction are required for exploitation.


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