CVE-2023-50247: fallo de gravedad baja en h2o
h2o QUIC state exhaustion DoS
Publicada el · Actualizada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
8Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 3.7epss 0.9%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Productos afectados
h2o · h2oCVEs relacionadas — h2o
En el mismo producto, de las más peligrosas a las menos.
CVE-2021-43848HIGHUnititialized memory access in h2oEPSS 2.7%CVE-2023-30847HIGHH2O vulnerable to read from uninitialized pointer in the reverse proxy handlerEPSS 0.9%CVE-2024-45403LOWH2O assertion failure when HTTP/3 requests are cancelledEPSS 0.7%CVE-2026-54340HIGHh2o has HTTP/2 state amplificationEPSS 0.5%CVE-2026-44453HIGHh2o is vulnerable to musl libc stack overflowEPSS 0.5%CVE-2026-55213HIGHh2o: musl libc stack overflow (QPACK)EPSS 0.5%