CVE-2023-50247 h2o QUIC state exhaustion DoS

2023-12-1219:56:20

CWE-770

GitHub_M

www.cve.org

h2o

http server

quic stack

state exhaustion

vulnerability

http/3

memory exhaustion

mitigation

3.7 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

0.001 Low

EPSS

Percentile

33.0%

JSON

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.

CNA Affected

[
  {
    "vendor": "h2o",
    "product": "h2o",
    "versions": [
      {
        "version": "<= 2.3.0-beta2",
        "status": "affected"
      }
    ]
  }
]