CVE-2023-50247

2023-12-1220:15:08

CWE-770

[email protected]

web.nvd.nist.gov

h2o

http server

vulnerability

state exhaustion attack

quic

memory exhaustion

mitigation

nvd

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

0.001 Low

EPSS

Percentile

32.9%

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.

Affected configurations

Vulners

NVD

Node

h2oh2oRange≤2.3.0-beta2

VendorProductVersionCPE
h2oh2o*cpe:2.3:a:h2o:h2o:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
h2o	h2o	*	cpe:2.3:a:h2o:h2o::::::::

CNA Affected

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