Vulnerabilities > CVE-2023-50247 - Unspecified vulnerability in Dena H2O

CVSS 7.5 - HIGH

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

NONE

Integrity impact

NONE

Availability impact

HIGH

network

low complexity

dena

NVD

Published: 2023-12-12

Updated: 2024-11-21

Summary

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support.

Vulnerable Configurations

Part	Description	Count
Application	Dena Dena H2O 0.9.0 Dena H2O 0.9.1 Dena H2O 0.9.2 Dena H2O 1.0.0 Dena H2O 1.0.1 Dena H2O 1.1.0 Dena H2O 1.1.1 Dena H2O 1.2.0 Dena H2O 1.3.0 Dena H2O 1.3.1 Dena H2O 1.4.0 Dena H2O 1.4.1 Dena H2O 1.4.2 Dena H2O 1.4.3 Dena H2O 1.4.4 Dena H2O 1.4.5 Dena H2O 1.5.0 Dena H2O 1.5.1 Dena H2O 1.5.2 Dena H2O 1.5.3 Dena H2O 1.5.4 Dena H2O 1.5.5 Dena H2O 1.6.0 Dena H2O 1.6.1 Dena H2O 1.6.2 Dena H2O 1.6.3 Dena H2O 1.7.0 Dena H2O 1.7.1 Dena H2O 1.7.2 Dena H2O 1.7.3 Dena H2O 2.0.0 Dena H2O 2.0.1 Dena H2O 2.0.2 Dena H2O 2.0.3 Dena H2O 2.0.4 Dena H2O 2.0.5 Dena H2O 2.0.6 Dena H2O 2.1.0 Dena H2O 2.2.0 Dena H2O 2.2.1 Dena H2O 2.2.2 Dena H2O 2.2.3 Dena H2O 2.2.4 Dena H2O 2.2.5 Dena H2O 2.2.6 Dena H2O 2.3.0	71

Summary

Vulnerable Configurations

References